s550q-k8凯发官网
s550q-s690q high yield strength quenched and tempered structural steel
1 main use
these products are mainly used to manufacture key components, construction machinery, mining machinery structures, etc. that are resistant to low temperatures and high strength.
2 grades and standards
grades: s550q, s620q, s690q. executive standard: bs en10025-6:2004
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 | 质量 | c | mn | si | p | s |
all grades | / | ≤0.20 | ≤1.70 | ≤0.80 | ≤0.025 | ≤0.015 |
l | ≤0.020 | ≤0.010 | ||||
l1 | ≤0.020 | ≤0.010 |
the calculation of the maximum carbon equivalent and carbon equivalent can be found in the standard bs en10025-6:2004.
3.3 mechanical properties
table 2 mechanical properties
牌号 | 屈服强度 σ0.2 mpa | 抗拉强度σb mpa | 延伸率δ5 % | v型冲击功 纵向 | ||
≥6- 50 | ＞50-100 | ≥6 -50 | ＞50-100 | |||
s550q | ≥550 | ≥530 | 640-820 | ≥16 | -20℃ ≥30j | |
s550ql | -40℃ ≥30j | |||||
s550ql1 | -60℃ ≥30j | |||||
s620q | ≥620 | ≥580 | 700-890 | ≥15 | -20℃ ≥30j | |
s620ql | -40℃ ≥30j | |||||
s620ql1 | -60℃ ≥30j | |||||
s690q | ≥690 | ≥650 | 770-940 | 760-930 | ≥14 | -20℃ ≥30j |
s690ql | -40℃ ≥30j | |||||
s690ql1 | -60℃ ≥30j | |||||
3.4 delivery status: quenching and tempering status