sm400~sm490 series hot rolled structural steel for welded structure-k8凯发官网
sm400~sm490 series hot rolled structural steel for welded structure
1 main use
this type of steel is suitable for the manufacture of steel structures such as construction machinery, building structures, bridges, vehicles, and petroleum containers.
2 grades and standards
grade: sm400a/b/c, sm490a/b/c, sm570;
executive standard: jis g3106-1999.
3 technical conditions of supply
3.1 product specifications
6~200×1800~3800×6000~12000mm
3.2 chemical composition
table 1, chemical composition, %
牌号 | c | si | mn | p | s | v | ti | nb | alt |
sm490a | ≤0.20 | ≤0.55 | 1.00～1.60 | 0.025 | 0.020 | / | |||
sm490b | 0.18~0.20 | ≤0.55 | ≤1.60 | 0.025 | 0.020 | / | |||
sm490c | ≤0.18 | ≤0.55 | ≤1.60 | 0.025 | 0.020 | / | |||
sm570 | 0.13～0.18 | 0.30～0.55 | 1.40～1.60 | ≤0.028 | ≤0.015 | proper content | |||
3.4 机械性能
表3 机械性能
牌号 | 厚度mm | 屈服强度mpa | 抗拉强度mpa | 延伸率a/ % | 纵向冲击功akv / j | |
sm490a | ≥16-40 | ≥315 | 490～610 | ＞5～16 ＞16～50 | ≥17 ≥21 | / |
＞16～40 | ≥295 | 490～610 | ||||
sm490b sm490c | ≤16 | ≥325 | 490～610 | 0℃，≥27 | ||
＞16～40 | ≥315 | 490～610 | 0℃，≥27 | |||
＞40～75 | ≥295 | 490～610 | 0℃，≥27 | |||
sm570 | ≤16 | ≥460 | 570～720 | ≥16 | ≥47 | |
＞16-40 | ≥450 | 570～720 | ≥16 | ≥47 | ||
＞40-75 | ≥430 | 570～720 | ≥16 | ≥47 | ||