SA210 GrC is a standard specification for carbon manganese steel grade materials used in boilers and superheaters. It belongs to a type of medium-temperature, high-strength carbon steel and is commonly used in the manufacture of pressure-bearing components such as superheater tubes and reheater tubes in power plant boilers.
Specification
Type: Hot-finished steel pipe, cold-finished steel pipe
Specification: OD:12.7-127 mm. WT: 0.9-12.7 mm. L.: Single Random, Double Random & Cut Length
Standard: ASTM A210, ASME SA210
Grades: A1, C
End: Plain End, Beveled End, Threaded
Packing: Wooden box or bundles protected with plastic paper, and suitably protected for sea-worthily delivery or as requested.
Chemical Requirements for ASTM A210 Seamless Tubes
| Grade | C(Max) | Mn | Si(Min) | P(Max) | S(Max) |
| C | 0.35 | 0.29~1.06 | 0.10 | 0.035 | 0.035 |
Tensile Requirements for ASTM A210 Seamless Tubes
| Grade | Tensile Strength(Mpa) | Yield Strength(Mpa) | Elongation (%) |
| C | ≥ 485 | ≥ 275 | ≥ 30 |
Production Process Flow
1. Steelmaking: Steel is smelted using an electric arc furnace or converter. Precise control of smelting temperature and time ensures the chemical composition of the molten steel meets standard requirements. During refining, deoxidation and alloying operations are performed to adjust the content of elements such as carbon, manganese, and silicon.
2. Continuous Casting: Qualified molten steel is poured into a crystallizer and gradually solidified into a steel billet using a cooling water system. The cooling rate needs to be controlled during continuous casting to avoid internal defects.
3. Piercing: The steel billet, heated to an appropriate temperature, is fed into a piercing mill and formed into a hollow tube billet through skew rolling or pressure piercing. Strict control of heating temperature and piercing speed is required in this step.
4. Rolling: The tube billet undergoes multiple rolling deformations, gradually reducing the wall thickness and extending the length. Maintaining an appropriate final rolling temperature during hot rolling ensures material properties.
5. Heat Treatment: The rolled steel pipe undergoes normalizing treatment, which involves heating to a specific temperature and holding it for a certain time, followed by air cooling, to improve the overall performance of the material.
6. Finishing: The steel pipes undergo subsequent processing such as straightening, cutting off the ends, and sampling for inspection to ensure that the product's dimensional accuracy and surface quality meet the requirements.