ISO3755, 340-550, 340-550W Carbon Steel
Casting grades: 340-550, 340-550W
Metal Type: Carbon Steels
Casting Process: Sand Casting or Lost Wax Precision Investment Casting
Standard: ISO 3755-1991
Similar Grade: GBT 11352 ZG310-570; DIN1681 GS60;BS3100 AW2; ГОСТ 977 50Л
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 % | Reduction of area 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. The testing ambient temperature was take as 23 ±- 5°C degree
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.
