25MnG Mould Steel Bar

 

SA-210C (25MnG) is the steel grade in the ASME SA-210 standard. It is a carbon-manganese steel small-diameter tube for boilers and superheaters, and a pearlitic heat-strength steel. China transplanted it to GB5310 in 1995 and named it 25MnG. Its chemical composition is simple, except for the high content of carbon and manganese, the rest is similar to 20G, so its yield strength is about 20% higher than 20G, and its plasticity and toughness are equivalent to 20G. The steel has a simple production process and good cold and hot workability. 


Using it instead of 20G can reduce the wall thickness, reduce the amount of material, and improve the heat transfer of the boiler. Its use part and use temperature are basically the same as 20G, mainly used for water wall, economizer, low temperature superheater and other components whose working temperature is lower than 500℃.

 

The steel production process is simple, hot and cold processing performance. Use it instead of 20G, you can thin wall thickness, reduce the amount of material, but also can improve the heat transfer of the boiler. The use of parts and the use of temperature and 20G is basically the same, mainly for the working temperature of less than 500 ℃ water wall, economizer, low-temperature superheater and other components.

 

Chemical Composition:

 

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Ni(%)Mo(%)Co(%)V(%)
0.18~0.240.17~0.370.80~1.10≤0.030≤0.030≤0.25≤0.25≤0.15≤0.08≤0.20

 

Mechanical Propoerties:

 

Yield
Strength
Rp0.2(MPa)
Tensile Strength
Rm(MPa)
Impact Energy
AKV(J)
Elongation (%)Reduction in Cross Section on Fracture
Z(%)
Impact toughness value αkv (J/cm2) Hardness(Brinell)
≥ 275 ≥ 485 ≥ 62

≥ 20

 ≥ 48

≥ 78

≤ 261

 


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