{"id":2717,"date":"2025-05-15T16:24:15","date_gmt":"2025-05-15T16:24:15","guid":{"rendered":"https:\/\/thepnguyenphat.kachersoft.io.vn\/?p=2717"},"modified":"2025-05-18T17:59:38","modified_gmt":"2025-05-18T17:59:38","slug":"mac-thep-la-gi-phan-loai-tieu-chuan-va-moi-thu-ban-can-biet-ve-mac-thep","status":"publish","type":"post","link":"https:\/\/thepnguyenphat.kachersoft.io.vn\/?p=2717","title":{"rendered":"M\u00e1c th\u00e9p l\u00e0 g\u00ec? Ph\u00e2n lo\u1ea1i, Ti\u00eau chu\u1ea9n v\u00e0 m\u1ecdi th\u1ee9 b\u1ea1n c\u1ea7n bi\u1ebft v\u1ec1 m\u00e1c th\u00e9p"},"content":{"rendered":"\t\t
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Ch\u00fang t\u00f4i \u0111\u1ed3ng \u00fd r\u1eb1ng c\u00f3 qu\u00e1 nhi\u1ec1u m\u00e1c th\u00e9p hi\u1ec7n nay tr\u00ean th\u1ecb tr\u01b0\u1eddng v\u00e0 ch\u00fang r\u1ea5t d\u1ec5 l\u00e0m ng\u01b0\u1eddi ti\u00eau d\u00f9ng b\u1ed1i r\u1ed1i khi l\u1ef1a ch\u1ecdn.<\/span><\/p>

Nh\u01b0ng th\u1ef1c t\u1ebf l\u00e0 b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i bi\u1ebft h\u1ebft m\u1ecdi th\u1ee9 m\u00e0 ch\u1ec9 c\u1ea7n quan t\u00e2m \u0111\u1ebfn nh\u1eefng th\u1ee9 quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 tr\u1edf th\u00e0nh ng\u01b0\u1eddi ti\u00eau d\u00f9ng th\u00f4ng th\u00e1i.<\/span><\/p>

V\u1eady, m\u00e1c th\u00e9p l\u00e0 g\u00ec? Th\u00f4ng s\u1ed1 ti\u00eau chu\u1ea9n tr\u00ean m\u00e1c th\u00e9p mang \u00fd ngh\u0129a c\u1ee5 th\u1ec3 nh\u01b0 th\u1ebf n\u00e0o? C\u00f3 nh\u1eefng ti\u00eau chu\u1ea9n \u0111\u00e1nh gi\u00e1 n\u00e0o v\u00e0 nh\u1eefng lo\u1ea1i n\u00e0o \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn hi\u1ec7n nay?\u00a0<\/span><\/p>

M\u00e1c th\u00e9p l\u00e0 g\u00ec?<\/b><\/h3>

M\u00e1c th\u00e9p<\/b> l\u00e0 thu\u1eadt ng\u1eef chuy\u00ean ng\u00e0nh d\u00f9ng \u0111\u1ec3 bi\u1ec3u hi\u1ec7n cho \u0111\u1ed9 ch\u1ecbu l\u1ef1c c\u1ee7a th\u00e9p. Hay n\u00f3i c\u00e1ch kh\u00e1c <\/span>m\u00e1c th\u00e9p<\/b> l\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c c\u1ee7a th\u00e9p. N\u00f3 cho bi\u1ebft kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c l\u1edbn hay nh\u1ecf c\u1ee7a s\u1ea3n ph\u1ea9m th\u00e9p \u0111\u00f3.<\/span><\/p>

\"\"<\/h3>

C\u00e1c lo\u1ea1i m\u00e1c th\u00e9p th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng<\/b><\/h3>
  • V\u1edbi th\u00e9p x\u00e2y d\u1ef1ng: SD295, SD390, CII, CIII, Gr60, Grade 460, SD49 (CT51), CIII, SD295, SD390, CB300-V, CB400-V, CB500-V.<\/span><\/li>
  • V\u1edbi th\u00e9p k\u1ebft c\u1ea5u: Tr\u00ean th\u1ecb tr\u01b0\u1eddng Vi\u1ec7t Nam hi\u1ec7n t\u1ea1i s\u1eed d\u1ee5ng th\u00e9p SS400, Q235, Q345B, hay trong c\u00e1c b\u1ea3n v\u1ebd ta th\u1ea5y ghi ch\u00fa th\u00e9p CCT34, CCT38\u2026<\/span><\/li><\/ul>

    T\u1ea1i sao l\u1ea1i c\u00f3 nhi\u1ec1u lo\u1ea1i m\u00e1c th\u00e9p kh\u00e1c nhau?<\/b><\/h3>

    Tr\u00ean th\u1ecb tr\u01b0\u1eddng c\u00f3 nhi\u1ec1u k\u00fd hi\u1ec7u v\u1ec1 m\u00e1c th\u00e9p l\u00e0m cho ng\u01b0\u1eddi ti\u00eau d\u00f9ng b\u1ed1i r\u1ed1i v\u00e0 kh\u00f4ng bi\u1ebft n\u00ean s\u1eed d\u1ee5ng lo\u1ea1i n\u00e0o cho ph\u00f9 h\u1ee3p. Tuy nhi\u00ean m\u1ed7i k\u00fd hi\u1ec7u \u0111\u1ec1u c\u00f3 \u00fd ngh\u0129a ri\u00eang c\u1ee7a n\u00f3.<\/span><\/p>

    K\u00fd hi\u1ec7u c\u1ee7a m\u00e1c th\u00e9p g\u1eafn v\u1edbi \u201cti\u00eau chu\u1ea9n s\u1ea3n xu\u1ea5t \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng\u201d c\u1ee7a th\u00e9p \u0111\u00f3. C\u00f3 nhi\u1ec1u ti\u00eau chu\u1ea9n m\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t \u00e1p d\u1ee5ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t nh\u01b0 Ti\u00eau chu\u1ea9n Vi\u1ec7t nam TCVN, ti\u00eau chu\u1ea9n Nh\u1eadt B\u1ea3n JIS, ti\u00eau chu\u1ea9n Nga (kh\u00f4ng ph\u1ed5 bi\u1ebfn b\u1eb1ng)\u2026 M\u1ed7i ti\u00eau chu\u1ea9n s\u1ebd c\u00f3 m\u1ed9t k\u00fd hi\u1ec7u kh\u00e1c nhau.<\/span><\/p>

    Ti\u00eau chu\u1ea9n \u00e1p d\u1ee5ng khi s\u1ea3n xu\u1ea5t l\u00e0: Ti\u00eau chu\u1ea9n TCVN 1651-1985, TCVN 1651-2008, JIS G3112 (1987) JIS G3112 \u2013 2004, TCCS 01:2010\/TISCO, A615\/A615M-04b, BS 4449 \u2013 1997.<\/span><\/p>

    C\u00e1c lo\u1ea1i m\u00e1c th\u00e9p x\u00e2y d\u1ef1ng th\u01b0\u1eddng d\u00f9ng<\/b><\/h3>

    Th\u01b0\u1eddng d\u00f9ng nh\u1ea5t l\u00e0 2 lo\u1ea1i SD v\u00e0 CB. V\u1eady 2 lo\u1ea1i n\u00e0y c\u1ee5 th\u1ec3 c\u00f3 ngh\u0129a l\u00e0 g\u00ec?<\/span><\/p>

    K\u00fd hi\u1ec7u SD tr\u00ean c\u00e1c lo\u1ea1i m\u00e1c th\u00e9p SD295, SD390, SD490<\/b><\/h3>

    \"\"<\/p>

    M\u00e1c th\u00e9p SD295<\/strong><\/p>

    Ch\u00fang ta hay nghe ng\u01b0\u1eddi ta g\u1ecdi l\u00e0 th\u00e9p SD295, SD390, SD490. \u0110\u00e2y l\u00e0 t\u00ean g\u1ecdi theo ti\u00eau chu\u1ea9n Nh\u1eadt B\u1ea3n.<\/span><\/p>

    Con s\u1ed1 \u0111\u1eb1ng sau th\u1ec3 hi\u1ec7n c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a th\u00e9p (trong k\u1ef9 thu\u1eadt ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00e2y l\u00e0 gi\u1edbi h\u1ea1n ch\u1ea3y c\u1ee7a th\u00e9p). V\u00ed d\u1ee5 SD240 c\u00f3 ngh\u0129a l\u00e0 th\u00e9p c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 240 N\/mm<\/span>2<\/span>.<\/span><\/p>

    K\u00fd hi\u1ec7u CB tr\u00ean c\u00e1c lo\u1ea1i m\u00e1c th\u00e9p CB240, CB300V, CB400V, CB500V<\/b><\/h3>

    \"\"<\/p>

    M\u00e1c th\u00e9p CB400v<\/strong><\/p>

    CB l\u00e0 k\u00ed hi\u1ec7u th\u1ec3 hi\u1ec7n \u201cc\u1ea5p \u0111\u1ed9 b\u1ec1n\u201d c\u1ee7a th\u00e9p. C vi\u1ebft t\u1eaft c\u1ee7a c\u1ea5p, B vi\u1ebft t\u1eaft c\u1ee7a \u0111\u1ed9 b\u1ec1n.<\/span><\/p>

    T\u00ean g\u1ecdi v\u00e0 k\u00fd hi\u1ec7u n\u00e0y tu\u00e2n theo ti\u00eau chu\u1ea9n Vi\u1ec7t Nam. Con s\u1ed1 \u0111\u1eb1ng sau(300, 400, 500\u2026) c\u00f3 \u00fd ngh\u0129a l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a th\u00e9p (trong k\u1ef9 thu\u1eadt ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00e2y l\u00e0 gi\u1edbi h\u1ea1n ch\u1ea3y c\u1ee7a th\u00e9p).<\/span><\/p>

    V\u00ed d\u1ee5 CB300 c\u00f3 ngh\u0129a l\u00e0 th\u00e9p c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 300 N\/mm<\/span>2<\/span>. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a r\u1eb1ng: n\u1ebfu m\u1ed9t c\u00e2y s\u1eaft c\u00f3 di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang l\u00e0 1mm<\/span>2<\/span> th\u00ec n\u00f3 s\u1ebd ch\u1ecbu l\u1ef1c \u0111\u01b0\u1ee3c m\u1ed9t l\u1ef1c k\u00e9o ho\u1eb7c n\u00e9n l\u00e0 kho\u1ea3ng 240N (24kg).<\/span><\/p>

    C\u00e1c k\u00fd hi\u1ec7u, t\u00ean g\u1ecdi kh\u00e1c<\/b><\/h3>

    Theo TCVN 1765 \u2013 75: Th\u00e9p \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u b\u1eb1ng ch\u1eef c\u00e1i CT, g\u1ed3m 3 ph\u00e2n nh\u00f3m A,B,C trong \u0111\u00f3 A l\u00e0 ch\u1ee7 y\u1ebfu.<\/span><\/p>

    • Ph\u00e2n nh\u00f3m A: \u0111\u1ea3m b\u1ea3o t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc, CTxx, B\u1ecf ch\u1eef A \u1edf \u0111\u1ea7u m\u00e1c th\u00e9p ch\u1eb3ng h\u1ea1n CT38, CT38n, CT38s l\u00e0 3 m\u00e1c c\u00f3 c\u00f9ng \u03c3 > 38kG\/mm<\/span>2<\/span> hay 380MPa, song \u1ee9ng v\u1edbi 3 m\u1ee9c kh\u1eed oxy kh\u00e1c nhau: l\u1eb7ng, b\u00e1n l\u1eb7ng v\u00e0 s\u00f4i \u1ee9ng v\u1edbi CT38, CT38n, CT38s. Vd: CT31, CT33. CT34, CT38, CT42, CT51, CT61\u2026<\/span><\/li>
    • Ph\u00e2n nh\u00f3m B: \u0111\u1ea3m b\u1ea3o th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc, quy \u0111\u1ecbnh th\u00e0nh ph\u1ea7n (tra s\u1ed5 tay). V\u00ed d\u1ee5 BCT31, BCT33. BCT34, BCT38, BCT42, BCT51, BCT61<\/span><\/li>
    • Ph\u00e2n nh\u00f3m C: Quy \u0111\u1ecbnh c\u1ea3 hai t\u00ednh ch\u1ea5t: c\u01a1 t\u00ednh v\u00e0 th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc. V\u00ed d\u1ee5: CCT34, CCT38, CCT42 v\u00e0 CCT52<\/span><\/li><\/ul>

      k\u00fd hi\u1ec7u th\u1ef1c t\u1ebf c\u00e1c lo\u1ea1i th\u00e9p tr\u00ean th\u1ecb tr\u01b0\u1eddng<\/b><\/h3>

      C\u00e1c k\u00fd hi\u1ec7u gi\u00fap ng\u01b0\u1eddi ti\u00eau d\u00f9ng nh\u1eadn bi\u1ebft s\u1ea3n ph\u1ea9m ch\u00ednh h\u00e3ng.<\/span><\/p>

      K\u00fd hi\u1ec7u th\u00e9p mi\u1ec1n Nam<\/b><\/h5>

      \"\"<\/h3>

      \u0110\u1ed1i v\u1edbi s\u1ea3n ph\u1ea9m Th\u00e9p cu\u1ed9n c\u1ee7a th\u01b0\u01a1ng hi\u1ec7u th\u00e9p mi\u1ec1n Nam tr\u00ean c\u00e1c cu\u1ed9n s\u1eaft phi 6 ho\u1eb7c phi 8 c\u00f3 ch\u1eef n\u1ed5i VNSTEEL.<\/span><\/p>

      Th\u00e9p thanh v\u1eb1n c\u00f3 k\u00fd hi\u1ec7u V, ch\u1eef v\u00e0 s\u1ed1 ch\u1ec9 r\u00f5 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 m\u00e1c th\u00e9p \u0111\u01b0\u1ee3c in n\u1ed5i, kho\u1ea3ng c\u00e1ch l\u1eadp l\u1ea1i c\u00e1c d\u1ea5u hi\u1ec7u n\u00e0y t\u1eeb 1 m \u0111\u1ebfn 1,2 t\u00f9y theo \u0111\u01b0\u1eddng k\u00ednh c\u00e2y th\u00e9p.<\/span><\/p>

      Th\u00e9p g\u00f3c \u0111\u1ec1u c\u1ea1nh c\u00f3 k\u00fd hi\u1ec7u ch\u1eef v tr\u00ean thanh Th\u00e9p \u0111\u01b0\u1ee3c in n\u1ed5i kho\u1ea3ng c\u00e1ch gi\u1eefa hai d\u1ea5u l\u00e0 t\u1eeb 1,2 \u0111\u1ebfn 1,4m.<\/span><\/p>

      K\u00fd hi\u1ec7u th\u00e9p H\u00f2a Ph\u00e1t<\/b><\/h5>

      \"\"<\/p>

      \u0110\u1ed1i v\u1edbi th\u00e9p cu\u1ed9n tr\u01a1n th\u00ec th\u00e9p H\u00f2a Ph\u00e1t c\u00f3 logo d\u1eadp n\u1ed5i ba tam gi\u00e1c v\u00e0 ch\u1eef H\u00f2a Ph\u00e1t k\u00e8m theo m\u00e1c th\u00e9p s\u1eed d\u1ee5ng.<\/span><\/p>

      \u0110\u1ed1i v\u1edbi th\u00e9p thanh v\u1eb1n th\u00ec c\u00f3 logo d\u1eadp n\u1ed5i ba tam gi\u00e1c v\u00e0 ch\u1eef H\u00f2a Ph\u00e1t k\u00e8m theo ch\u1ee7ng lo\u1ea1i v\u00e0 m\u00e1c th\u00e9p.<\/span><\/p>

      K\u00fd hi\u1ec7u th\u00e9p Pomina<\/b><\/h5>

      \"\"<\/p>

      Th\u00e9p Pomina c\u00f3 h\u00ecnh bi\u1ec3u t\u01b0\u1ee3ng qu\u1ea3 t\u00e1o \u0111\u1eb7c tr\u01b0ng sau \u0111\u00f3 \u0111\u1ebfn m\u00e1c th\u00e9p c\u00e1ch nhau ch\u1eebng 1-1.2cm. Logo v\u00e0 m\u1ed7i con s\u1ed1 th\u1ec3 hi\u1ec7n \u0111\u01b0\u1eddng k\u00ednh c\u00e1ch nhau b\u1edfi m\u1ed9t g\u00e2n th\u00e9p.<\/span><\/p>

      K\u00fd hi\u1ec7u th\u00e9p Vi\u1ec7t Nh\u1eadt<\/b><\/h5>

      \"\"<\/p>

      Th\u00e9p Vi\u1ec7t \u00dac c\u00f3 k\u00fd hi\u1ec7u l\u00e0 bi\u1ec3u t\u01b0\u1ee3ng con Kangaroo, k\u00e8m d\u00f2ng ch\u1eef V-UC v\u00e0 m\u00e1c th\u00e9p CB3 tr\u00ean th\u00e2n c\u00e2y th\u00e9p.<\/span><\/p>

      B\u1ea3ng tra m\u00e1c th\u00e9p theo ti\u00eau chu\u1ea9n<\/b><\/h3>
      Ti\u00eau chu\u1ea9n
      Standard<\/th>      		M\u00e1c th\u00e9p
      Grade<\/th>      		Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc
      Chemical Composition<\/th><\/tr>
      C<\/th>Si<\/th>Mn<\/th>P (max)<\/th>S (max)<\/th><\/tr><\/thead>
      TCVN 1651-85 (1765-85)<\/td>CT33<\/td>0.06 – 0.12<\/td>0.12 – 0.30<\/td>0.25 – 0.50<\/td>0.04<\/td>0.045<\/td><\/tr>
      CT34<\/td>0.09 – 0.16<\/td>0.12 – 0.30<\/td>0.30 – 0.60<\/td>0.04<\/td>0.045<\/td><\/tr>
      CT38<\/td>0.14 – 0.22<\/td>0.12 – 0.30<\/td>0.30 – 0.60<\/td>0.04<\/td>0.045<\/td><\/tr>
      CT42<\/td>0.18 – 0.27<\/td>0.17 – 0.37<\/td>0.50 – 0.80<\/td>0.04<\/td>0.045<\/td><\/tr>
      TCVN 3104-79<\/td>25MnSi<\/td>0.20 – 0.27<\/td>0.50 – 0.80<\/td>1.20 – 1.60<\/td>0.04<\/td>0.04<\/td><\/tr>
      JIS G3505 2004<\/td>SWRW10<\/td>0.15 max<\/td>\u2014<\/td>0.30 max<\/td>0.035<\/td>0.035<\/td><\/tr>
      SWRW12A<\/td>0.15 max<\/td>\u2014<\/td>0.30 max<\/td>0.035<\/td>0.035<\/td><\/tr>
      JIS G3112<\/td>SD295A<\/td>0.27 max<\/td>0.55 max<\/td>1.60 max<\/td>0.040<\/td>0.040<\/td><\/tr>
      ASTM A615\/A615M-94<\/td>Gr40<\/td>0.30 max<\/td>0.50 max<\/td>1.20 max<\/td>0.050<\/td>0.050<\/td><\/tr>
      Gr60<\/td>0.30 max<\/td>0.50 max<\/td>1.50 max<\/td>0.050<\/td>0.050<\/td><\/tr>
      Gr75<\/td>0.32 max<\/td>0.50 max<\/td>1.60 max<\/td>0.050<\/td>0.050<\/td><\/tr>
      BS 4449<\/td>Gr250<\/td>0.25 max<\/td>\u2014<\/td>1.60 max<\/td>0.060<\/td>0.060<\/td><\/tr>
      Gr460<\/td>0.55 max<\/td>\u2014<\/td>1.70 max<\/td>0.060<\/td>0.060<\/td><\/tr>
      \u0413\u041e\u0421\u0422 5780-82<\/td>25\u04132\u0421<\/td>0.22 \u2013 0.29<\/td>0.50 \u2013 0.80<\/td>1.30 \u2013 1.60<\/td>0.035<\/td>0.040<\/td><\/tr>
      \u0413\u041e\u0421\u0422 380-71<\/td>CT3<\/td>0.14 \u2013 0.22<\/td>0.05 \u2013 0.17<\/td>0.40 \u2013 0.65<\/td>0.040<\/td>0.050<\/td><\/tr>
      CT4<\/td>0.17 \u2013 0.25<\/td>0.12 \u2013 0.25<\/td>0.50 \u2013 0.80<\/td>0.040<\/td>0.045<\/td><\/tr>
      CT5<\/td>0.27 \u2013 0.37<\/td>0.17 \u2013 0.37<\/td>0.50 \u2013 0.80<\/td>0.040<\/td>0.045<\/td><\/tr><\/tbody><\/table><\/div>

      Khi x\u00e2y nh\u00e0, l\u00e0m c\u00f4ng tr\u00ecnh n\u00ean s\u1eed d\u1ee5ng m\u00e1c th\u00e9p n\u00e0o ph\u00f9 h\u1ee3p?<\/b><\/h3>

      Th\u1ef1c t\u1ebf ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng lo\u1ea1i m\u00e1c th\u00e9p n\u00e0o c\u0169ng \u0111\u01b0\u1ee3c. \u0110\u1ed1i v\u1edbi th\u00e9p m\u00e1c th\u1ea5p th\u00ec ch\u00fang ta ph\u1ea3i s\u1eed d\u1ee5ng m\u1eadt \u0111\u1ed9 th\u00e9p d\u00e0y h\u01a1n, s\u1ed1 c\u00e2y th\u00e9p tr\u00ean m\u1ed9t \u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch nhi\u1ec1u h\u01a1n. Vi\u1ec7c n\u00e0y d\u1eabn t\u1edbi kh\u00f4ng kinh t\u1ebf. Theo kinh nghi\u1ec7m th\u00ec:<\/span><\/p>

      • V\u1edbi nh\u00e0 th\u1ea5p t\u1ea7ng (<7 t\u1ea7ng): Ch\u1ec9 c\u1ea7n s\u1eed d\u1ee5ng m\u00e1c th\u00e9p c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 th\u1ea5p l\u00e0 CB300 ho\u1eb7c SD295 (Hai lo\u1ea1i n\u00e0y c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c t\u01b0\u01a1ng \u0111\u01b0\u01a1ng nhau).<\/span><\/li>
      • V\u1edbi nh\u00e0 cao t\u1ea7ng t\u1ea7ng (>7 t\u1ea7ng): N\u00ean d\u00f9ng m\u00e1c th\u00e9p c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 cao h\u01a1n l\u00e0 CB400 ho\u1eb7c SD390. Th\u1eadm ch\u00ed s\u1eed d\u1ee5ng th\u00e9p c\u01b0\u1eddng \u0111\u1ed9 cao h\u01a1n n\u1eefa l\u00e0 CB500 ho\u1eb7c SD490 (Hai lo\u1ea1i n\u00e0y c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c t\u01b0\u01a1ng \u0111\u01b0\u01a1ng nhau).<\/span><\/li><\/ul>

        Tuy nhi\u00ean, vi\u1ec7c n\u00e0y c\u00f2n ph\u1ee5 thu\u1ed9c r\u1ea5t l\u1edbn v\u00e0o thi\u1ebft k\u1ebf c\u1ee7a c\u00f4ng tr\u00ecnh, c\u00f3 th\u1ec3 ch\u00fang ta s\u1ebd c\u1ea7n c\u00e1c lo\u1ea1i m\u00e1c th\u00e9p kh\u00e1c nhau cho nh\u1eefng v\u1ecb tr\u00ed ch\u1ecbu l\u1ef1c kh\u00e1c nhau. <\/span>B\u1edfi v\u1eady b\u1ea1n h\u00e3y tham kh\u1ea3o \u00fd ki\u1ebfn c\u1ee7a k\u1ef9 s\u01b0 x\u00e2y d\u1ef1ng tr\u01b0\u1edbc khi \u0111\u01b0a ra b\u1ea5t k\u1ef3 quy\u1ebft \u0111\u1ecbnh n\u00e0o v\u1ec1 vi\u1ec7c s\u1eed d\u1ee5ng m\u00e1c th\u00e9p nh\u00e9!<\/b><\/p>

        S\u1ef1 kh\u00e1c nhau gi\u1eefa m\u00e1c th\u00e9p CT34 v\u00e0 CCT34<\/b><\/h3>

        Nh\u01b0 \u0111\u00e3 gi\u1ea3i th\u00edch \u1edf ti\u00eau chu\u1ea9n Vi\u1ec7t Nam \u1edf ph\u1ea7n tr\u01b0\u1edbc, th\u00e9p CT34 thu\u1ed9c ph\u00e2n nh\u00f3m A (quy \u0111\u1ecbnh \u0111\u1ea3m b\u1ea3o t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc), c\u00f2n th\u00e9p CCT34 thu\u1ed9c ph\u00e2n nh\u00f3m C (quy \u0111\u1ecbnh c\u1ea3 hai t\u00ednh ch\u1ea5t: c\u01a1 t\u00ednh v\u00e0 th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc).<\/span><\/p>

        M\u00e1c th\u00e9p SS400<\/b><\/h3>

        Th\u00e9p SS400 l\u00e0 g\u00ec?<\/b><\/h4>

        Th\u00e9p SS400 l\u00e0 lo\u1ea1i m\u00e1c th\u00e9p cacbon th\u00f4ng th\u01b0\u1eddng, th\u00e9p d\u00f9ng trong ch\u1ebf t\u1ea1o chi ti\u1ebft m\u00e1y, khu\u00f4n m\u1eabu\u2026 theo ti\u00eau chu\u1ea9n c\u1ee7a Nh\u1eadt B\u1ea3n JIS G3101 (1987).\u00a0<\/span><\/p>

        Th\u00e9p SS400 d\u1ea1ng t\u1ea5m th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t trong qu\u00e1 tr\u00ecnh luy\u1ec7n th\u00e9p c\u00e1n n\u00f3ng th\u00f4ng qua qu\u00e1 tr\u00ecnh c\u00e1n th\u01b0\u1eddng \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean 1000\u2103 \u0111\u1ec3 t\u1ea1o th\u00e0nh ph\u1ea9m cu\u1ed1i c\u00f9ng.<\/span><\/p>

        Th\u00e9p SS400 t\u1ea5m c\u00f3 m\u00e0u xanh, \u0111en, t\u1ed1i \u0111\u1eb7c tr\u01b0ng, \u0111\u01b0\u1eddng m\u00e9p bi\u00ean th\u01b0\u1eddng bo tr\u00f2n, x\u00f9 x\u00ec, bi\u00ean m\u00e0u g\u1ec9 s\u00e9t khi \u0111\u1ec3 l\u00e2u. Trong khi \u0111\u00f3 c\u00e1c lo\u1ea1i th\u00e9p SS400 d\u1ea1ng cu\u1ed9n th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t trong qu\u00e1 tr\u00ecnh c\u00e1n ngu\u1ed9i \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p.<\/span><\/p>

        K\u00fd hi\u1ec7u th\u00e9p SS400<\/b><\/h4>

        Trong k\u00fd hi\u1ec7u SS400, hai ch\u1eef SS l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a Steel Structure (k\u1ebft c\u1ea5u th\u00e9p), c\u00f2n ch\u1ec9 s\u1ed1 400 ph\u00eda sau th\u1ec3 hi\u1ec7n \u0111\u1ed9 b\u1ec1n k\u00e9o (\u0111\u01a1n v\u1ecb N\/mm<\/span>2<\/span>).<\/span><\/p>

        C\u00e1c lo\u1ea1i th\u00e9p c\u00f3 k\u00fd hi\u1ec7u n\u00e0y c\u00f3 gi\u1edbi h\u1ea1n b\u1ec1n k\u00e9o t\u1eeb kho\u1ea3ng 400-510 MPa. \u0110\u1ed9 b\u1ec1n k\u00e9o n\u00e0y x\u1ea5p x\u1ec9 ngang b\u1eb1ng v\u1edbi m\u00e1c th\u00e9p CT3 c\u1ee7a Nga, CT42, CT51 c\u1ee7a Vi\u1ec7t Nam, Q235 c\u1ee7a Trung Qu\u1ed1c\u2026<\/span><\/p>

        M\u00e1c th\u00e9p SS400 n\u1eb1m trong nh\u00f3m \u201cRolled steel for general structures\u201d (th\u00e9p c\u00e1n th\u00f4ng d\u1ee5ng). C\u00e1c m\u00e1c th\u00e9p n\u00e0y kh\u00f4ng quy \u0111\u1ecbnh nghi\u00eam v\u1ec1 th\u00e0nh ph\u1ea7n, mi\u1ec5n l\u00e0 th\u00e9p c\u00f3 th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc P<=0,05% S<=0,05% \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng b\u1ec1n k\u00e9o.<\/span><\/p>

        Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p SS400<\/b><\/h4>

        JIS G3101 x\u00e1c \u0111\u1ecbnh th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p SS400 nh\u01b0 sau:<\/span><\/p>

        • Carbon (C) kh\u00f4ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong ti\u00eau chu\u1ea9n.<\/span><\/li>
        • Mangan (Mn) kh\u00f4ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong ti\u00eau chu\u1ea9n.<\/span><\/li>
        • Ph\u1ea7n tr\u0103m Ph\u1ed1t pho (P) t\u1ed1i \u0111a l\u00e0 0.050%.<\/span><\/li>
        • Ph\u1ea7n tr\u0103m L\u01b0u hu\u1ef3nh (S) t\u1ed1i \u0111a l\u00e0 0.050%.<\/span><\/li><\/ul>

          \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a th\u00e9p SS400<\/b><\/h4>

          B\u1ec1n k\u00e9o (tensile strength): 400-510 Mpa<\/span><\/p>

          B\u1ec1n ch\u1ea3y chia theo \u0111\u1ed9 d\u00e0y:<\/span><\/p>

          • Nh\u1ecf h\u01a1n 16 mm: 245 Mpa<\/span><\/li>
          • T\u1eeb 16 \u2013 40 mm: 235 Mpa<\/span><\/li>
          • L\u1edbn h\u01a1n 40 mm: 215 Mpa<\/span><\/li><\/ul>

            \u0110\u1ed9 d\u00e3n d\u00e0i t\u01b0\u01a1ng \u0111\u1ed1i % chia theo \u0111\u1ed9 d\u00e0y<\/span><\/p>

            • Nh\u1ecf h\u01a1n 25 mm: 20 %<\/span><\/li>
            • L\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 25 mm: 24 %<\/span><\/li><\/ul>

              \u0110\u00e2y l\u00e0 lo\u1ea1i th\u00e9p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn, cho ra c\u00e1c s\u1ea3n ph\u1ea9m th\u00e9p c\u00f3 t\u00ednh \u1ee9ng d\u1ee5ng cao trong ng\u00e0nh c\u00f4ng nghi\u1ec7p n\u1eb7ng \u1edf n\u01b0\u1edbc ta v\u00e0 nhi\u1ec1u n\u01b0\u1edbc tr\u00ean th\u1ebf gi\u1edbi.<\/span><\/p>

              M\u00e1c th\u00e9p C45<\/b><\/h3>

              Th\u00e9p C45 l\u00e0 g\u00ec?<\/b><\/h4>

              Theo ti\u00eau chu\u1ea9n Vi\u1ec7t Nam TCVN 1766-75, th\u00e9p C45 l\u00e0 lo\u1ea1i th\u00e9p cacbon k\u1ebft c\u1ea5u ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t v\u1edbi n\u1ed3ng \u0111\u1ed9 cacbon trong th\u00e9p v\u00e0o kho\u1ea3ng 0.45%.<\/span><\/p>

              \u0110\u00e2y l\u00e0 lo\u1ea1i m\u00e1c th\u00e9p hay \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra c\u00e1c s\u1ea3n ph\u1ea9m th\u00e9p c\u00f3 t\u00ednh \u1ee9ng d\u1ee5ng cao trong l\u0129nh v\u1ef1c c\u01a1 kh\u00ed, x\u00e2y d\u1ef1ng nh\u01b0: Bulong \u1ed1c v\u00edt, ty ren, b\u00e1nh \u0111\u00e0\u2026<\/span><\/p>

              Lo\u1ea1i m\u00e1c th\u00e9p n\u00e0y hay \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u1ebf t\u1ea1o bulong m\u00f3ng, \u1ed1c v\u00edt\u2026<\/span><\/p>

              K\u00fd hi\u1ec7u c\u1ee7a th\u00e9p C45<\/b><\/h4>

              Trong k\u00fd hi\u1ec7u m\u00e1c th\u00e9p C45, ch\u1eef Ch\u1eef \u201cC\u201d l\u00e0 k\u00ed hi\u1ec7u c\u1ee7a th\u00e9p Cacbon, c\u00f2n s\u1ed1 45 t\u01b0\u01a1ng \u1ee9ng ph\u00eda sau th\u1ec3 hi\u1ec7n trong m\u00e1c th\u00e9p c\u00f3 ch\u1ee9a h\u00e0m l\u01b0\u1ee3ng Cacbon l\u00e0 0,45%.<\/span><\/p>

              B\u00ean c\u1ea1nh th\u00e0nh ph\u1ea7n ch\u00ednh l\u00e0 cacbon, lo\u1ea1i th\u00e9p n\u00e0y c\u00f2n ch\u1ee9a c\u00e1c t\u1ea1p ch\u1ea5t kh\u00e1c nh\u01b0 silic, mangan, l\u01b0u hu\u1ef3nh, crom, ph\u1ed1t pho, \u0111\u1ed3ng, niken\u2026<\/span><\/p>

              Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p C45<\/b><\/h4>

              Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p C45 bao g\u1ed3m:<\/span><\/p>

              • Cacbon t\u1eeb 0.42 \u2013 0.50%<\/span><\/li>
              • Silic t\u1eeb 0.17 \u2013 0.37%<\/span><\/li>
              • Mangan t\u1eeb 0.50 \u2013 0.80%<\/span><\/li>
              • Photpho v\u00e0 l\u01b0u hu\u1ef3nh \u2264 0.040%<\/span><\/li>
              • Crom v\u00e0 Niken \u2264 0.25%<\/span><\/li><\/ul>

                \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a th\u00e9p C45<\/b><\/h4>

                M\u00e1c th\u00e9p C45 c\u00f3 ch\u1ec9 s\u1ed1 \u0111\u1ed9 b\u1ec1n nh\u01b0 sau:<\/span><\/p>

                • \u0110\u1ed9 b\u1ec1n \u0111\u1ee9t \u03c3b (Mpa): 610<\/span><\/li>
                • \u0110\u1ed9 b\u1ec1n ch\u1ea3y \u03c3c (Mpa): 360<\/span><\/li>
                • \u0110\u1ed9 gi\u00e3n d\u00e0i t\u01b0\u01a1ng \u0111\u1ed1i \u03b4 (%): 16<\/span><\/li>
                • \u0110\u1ed9 c\u1ee9ng HRC: 23\u00a0\u00a0<\/span><\/li><\/ul>

                  Do c\u00f3 \u0111\u1ed9 b\u1ec1n k\u00e9o t\u1eeb 570-690 Mpa, th\u00e9p C45 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng b\u00e0o m\u00f2n, ch\u1ed1ng oxy h\u00f3a t\u1ed1t v\u00e0 ch\u1ecbu \u0111\u01b0\u1ee3c t\u1ea3i tr\u1ecdng cao.<\/span><\/p>

                  T\u00ednh \u0111\u00e0n h\u1ed3i t\u1ed1t, kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u01b0\u1ee3c va \u0111\u1eadp m\u1ea1nh c\u1ee7a th\u00e9p C45 c\u0169ng \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1edfi \u0111\u1ed9 b\u1ec1n k\u00e9o v\u00e0 gi\u1edbi h\u1ea1n ch\u1ea3y cao.<\/span><\/p>

                  Mong r\u1eb1ng v\u1edbi t\u1ea5t c\u1ea3 nh\u1eefng th\u00f4ng tin m\u00e0 <\/span>Th\u00e9p Nguy\u00ean Ph\u00e1t<\/b> cung c\u1ea5p, b\u1ea1n \u0111\u00e3 hi\u1ec3u \u0111\u01b0\u1ee3c m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng h\u01a1n m\u00e1c th\u00e9p l\u00e0 g\u00ec v\u00e0 nh\u1eefng ti\u00eau chu\u1ea9n m\u00e1c th\u00e9p th\u00f4ng d\u1ee5ng t\u1ea1i Vi\u1ec7t Nam.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                  Ch\u00fang t\u00f4i \u0111\u1ed3ng \u00fd r\u1eb1ng c\u00f3 qu\u00e1 nhi\u1ec1u m\u00e1c th\u00e9p hi\u1ec7n nay tr\u00ean th\u1ecb tr\u01b0\u1eddng v\u00e0 ch\u00fang r\u1ea5t d\u1ec5 l\u00e0m ng\u01b0\u1eddi ti\u00eau d\u00f9ng b\u1ed1i r\u1ed1i khi l\u1ef1a ch\u1ecdn. Nh\u01b0ng th\u1ef1c t\u1ebf l\u00e0 b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i bi\u1ebft h\u1ebft m\u1ecdi th\u1ee9 m\u00e0 ch\u1ec9 c\u1ea7n quan t\u00e2m \u0111\u1ebfn nh\u1eefng th\u1ee9 quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 tr\u1edf th\u00e0nh ng\u01b0\u1eddi<\/p>\n","protected":false},"author":1,"featured_media":2711,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[47],"tags":[58,57,63,64,65],"class_list":["post-2717","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tieu-chuan-ky-hieu-thep","tag-ky-hieu-thep","tag-mac-thep","tag-thep-c45","tag-thep-cb400v","tag-thep-sd295"],"_links":{"self":[{"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=\/wp\/v2\/posts\/2717","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2717"}],"version-history":[{"count":25,"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=\/wp\/v2\/posts\/2717\/revisions"}],"predecessor-version":[{"id":3841,"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=\/wp\/v2\/posts\/2717\/revisions\/3841"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=\/wp\/v2\/media\/2711"}],"wp:attachment":[{"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2717"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2717"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thepnguyenphat.kachersoft.io.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2717"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}