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The Difference Between 20G, A106 C And A210 C Boiler Tube

Time:2019-11-18 From:Ouersen Steel Industrial Limited Hits:

        20G, ASTM A106 C and ASTM 210 C boiler tubingbelong to C-Mn steel, can be used forboilersof subcritical and supercritical power generationwhich needhigh requireent forhig strengthand good process performance underhigh pressure enviroment.

        20G come fromChinese national standardGB5310.A106 Cand A210 C belong to the ASTM and ASME standards. The chart below showed the chemical composition and mechanical propertiescomparation of 20G, ASTM A106,A-210C:

Standard

C(%)

Mn(%)

Si(%)

Cr

S(%)

P(%)

20G

0.17-0.24

0.35-0.65

0.17-0.37

≤0.25

≤0.030

≤0.030

SA-210C

≤0.27

0.29-1.06

≥0.10

≤0.4

≤0.025

≤0.025

ASTM -106C

≤0.35

0.29-1.06

≥0.10

≤0.4

≤0.035

≤0.035

Material

Tensile Strength (Mpa), Min.

Yield Strength (Mpa), Min.

20G

410-550

245

SA-210C

485

275

ASTM a-106C

485

275

        We can learn that they has similar chemical composition and physical property. It is common for a customer as analternativematerial.20Gseamless tubingis the most commonly used steel tube for boilersystem.It is mainly used to manufacture high pressure boiler pipe fittings, low temperature section superheater, reheater, economizer and water wall etc.

        As a commonly used C-Mn steel,ASTM A106 Grade Ctubingis used for large diameter and high temperature andpressureboiler and Superheater. Ithas similarchemical compositionbut highercarbon and manganese content,they also has a similarplasticity and toughness butthe yield strength is about 12% higher than that of 20G.Manufacturing header with A106 Gr C instead of 20G (economizer, water cooling wall, low temperature superheater and reheater header) can reduce the wall thickness of about 10%, which can save the cost of materials, but also reduce the workload of welding, improve the heat transfer condition of boiler. It’s working pressure is 6 ~ 13.9MPa and steam temperature is 450~580 ℃.

        210C seamless carbon steel pipeis also widely used for for water cooling wall, economizer of boiler parts. Like A106C, except similar chemicalcompositionas 20G, itsyield strength is about 20% higherwhile the plasticity and toughness are equivalent to 20G.Because of simple production process and good properties. It is mainly used for water cooled wall, economizer, low temperature superheater and other parts with working temperature lower than 500 ℃。

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