ISO3755, 270-480, 270-480W Carbon Steel
Casting grades: 270-480, 270-480W
Metal Type: Carbon Steels
Casting Process: Sand Casting or Lost Wax Precision Investment Casting
Standard: ISO 3755 – 1991 Cast carbon steels for general engineering purposes
ISO 3755 was revised by ISO 14737:2015 specifies requirements for carbon and low alloy cast steel grades for general applications.
Similar Grade:
GB/T 11352 Grade ZG270-500;
ASTM A27 Grade 70-40[485-275] (UNS Code: J02501);
EN10213 Grade GP280GH, EN Number. 1.0625
DIN1681 Grade GS52;
JIS5101 Grade SC480;
ГОСТ 977 Grade 35Л
Heat treatment: Annealing, Quenching and Tempering
| Steel Grade | C % | Mn % | Si % | P % | S % | Ni % | Cr % | Cu % | Mo % | V % |
| 270-480 | – | – | – | 0.035 | 0.035 | – | – | – | – | |
| 270-480W | 0.25 | 1.20 | 0.60 | 0.035 | 0.035 | 0.40 | 0.35 | 0.40 | 0.15 | 0.05 |
| Steel Grade | Tensile Strength Rm Mpa | Upper Yield Re, Mpa | Elongation % | Reduction of area Z % | Impact Strength KV J |
| 270-480 | 480-630 | 270 | 18 | 25 | 22 |
| 270-480W | 480-630 | 270 | 18 | 25 | 22 |
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 270-480 and 270-480w, 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, 270-480 is non-weldable grade casting materiel, it’s choice of chemical composition shall be left to the discretion of the manufacturer. But 270-480W is weldable grade, ISO 3755 standard indicate the detailed chemistry for welding purpose. In fact, 270-480 and 270-480W have same mechaincal property.
