ISO3755, 340-550, 340-550W Carbon Steel
铸造等级：340-550，340-550W
金属类型：碳钢
Casting Process: Sand Casting or Lost Wax Precision Investment Casting
Standard: ISO 3755-1991
类似等级：GBT 11352 ZG310-570;DIN1681 GS60; BS3100 AW2;977 50光
Heat treatment: Annealing, Quenching and Tempering
| Steel Grade | C ％ | Mn％ | Si % | P % | s％ | Ni % | Cr % | Cu % | mo％ | V % |
| 340-550 | – | – | – | 0.035 | 0.035 | – | – | – | – | |
| 340-550W | 0.25 | 1.50 | 0.60 | 0.035 | 0.035 | 0.40 | 0.35 | 0.40 | 0.15 | 0.05 |
1. Ni+Cr+Cu+Mo+V, the sum of residual elements shall not exceed 1.00%
| Steel Grade | Tensile Strength Rm Mpa |
Upper Yield Re, Mpa | Elongation % |
减少面积 z％ |
Impact Strength KV J |
| 340-550 | 550-700 | 340 | 15 | 21 | 20 |
| 340-550W | 550-700 | 340 | 15 | 21 | 20 |
1. Mechanical properties are obtained from 28mm thick standard test blocks.
2.测试环境温度为23±-5°C的程度
3. For Grades 340-550 and 340-550w, the casting will have an Re of 260 MPa and an Rm of 500-650MPa, in sectioins from 28mm up to 40mm.
What’s the means “W” in ISO3755?
“W” means WELDABLE GRADE. For example, 340-550 is non-weldable grade casting materiel, it’s choice of chemical composition shall be left to the discretion of the manufacturer. But 340-550W is weldable grade, ISO 3755 standard indicate the detailed chemistry for welding purpose. In fact, 340-550 and 340-550W have same mechanical property.
