Standards：GBl8248 Chinese national standard ASTMA519 Standard of American Society of Testing MaterialsApplication：Used as seamless steel tubes of large calibers for manufacturing gas cylindersModel No.of major steel tubes：4130XDiamensional tolerances:
Types of steel tubes
Outer diameter
Wall thickness
Hot-rolled tubes
Tube sizes(mm)
Tolerances(mm)
Tube sizes (mm)
Tolerances(mm)
φ559
±1.0％
17.0
－0％，＋25 Standards： GB3087 Chinese national standard GB5310 Chinese national standard ASME SA106 Boiler and pressure vessel code of ASME ASME SA333 Boiler and pressure vessel code of ASME ASME SA335 Boiler and pressure vessel code of ASME DIN17175 Deutsches industrial standard EN10216-2 European standard for pressure pipes Application： For boilers and pressure vessels of medium and low pressures(normally,the cintainer and steam pipelines With the operating pressure not higher than 5.88Mpa，operating temperature below 450℃);for high-pressure boilers(normally，the cintainers，steam pipelines and petrochemical pipelines with the operating pressure not higher than 9.8Mpa．operating temperature between 450℃~650℃)． Model No.of major steel tubes： 10,20,20G,20MnG,25MnG,15CrMoG,12Cr2MoG,12Cr1MoVG,10Cr9Mo1VNb,SA106B,SA106C,SA333 grade I,SA333 gradeⅥ,SA335 Ps,SA335 P11,SA335 P12,SA335P22,SA335 Pm91,SA335 P92，ST45.8/Ⅲ，15Mo3，13CrMo44,10CrMo910,15NiCuMoNb5-6-4．etc． Dimenslonal tolerances: 钢管种类 外径（D） 壁厚（S） 冷拔管 钢管外径(mm) 允许偏差(mm) 钢管壁厚(mm) 允许偏差(mm) ＞114～159 ±0.8％ ≤30 ±10％ ＞159～219 ±1.0％ 热轧管 ＞219～457 ±1.0％ ≤20 －10％，＋12.5％ ＞20～40 －10％，＋10％ ＞457～1066 ±0.9％ ＞40～70 －7％，＋9％ ＞70～120 －6％，＋8％ Mechanical properties：
Standard codes
Models of steel tubes
Tensite strength（MPa）
Yield strength（MPa）
Yield ration
Elongation（％）
Absorbed-in-fracture energy（J）
Hardness
Q/321088HGB3
4130X
725～865
485～735
≤0.85
≥20
－40℃≥40
195～269HBChemical composition:
Standard codes
Models of steel tubes
Chemical compositions（％）
C
Si
Mn
P
S
Cr
Ni
Cu
Mo
V
Q/321088HGB3
4130X
0.25～0.35
0.15～0.35
0.40～0.90
≤0.020
≤0.010
0.80～1.10
≤0.25
≤0.20
0.15～0.25
≤0.08
www.sunnysteel.com
Tel.:+8621-3378 0199 Fax:+8621 5107 9722 MSN Online Consultation
Types of steel tubes
Outer diameter
Wall thickness
Hot-rolled tubes
Tube sizes(mm)
Tolerances(mm)
Tube sizes (mm)
Tolerances(mm)
φ559
±1.0％
17.0
－0％，＋25 Standards： GB3087 Chinese national standard GB5310 Chinese national standard ASME SA106 Boiler and pressure vessel code of ASME ASME SA333 Boiler and pressure vessel code of ASME ASME SA335 Boiler and pressure vessel code of ASME DIN17175 Deutsches industrial standard EN10216-2 European standard for pressure pipes Application： For boilers and pressure vessels of medium and low pressures(normally,the cintainer and steam pipelines With the operating pressure not higher than 5.88Mpa，operating temperature below 450℃);for high-pressure boilers(normally，the cintainers，steam pipelines and petrochemical pipelines with the operating pressure not higher than 9.8Mpa．operating temperature between 450℃~650℃)． Model No.of major steel tubes： 10,20,20G,20MnG,25MnG,15CrMoG,12Cr2MoG,12Cr1MoVG,10Cr9Mo1VNb,SA106B,SA106C,SA333 grade I,SA333 gradeⅥ,SA335 Ps,SA335 P11,SA335 P12,SA335P22,SA335 Pm91,SA335 P92，ST45.8/Ⅲ，15Mo3，13CrMo44,10CrMo910,15NiCuMoNb5-6-4．etc． Dimenslonal tolerances: 钢管种类 外径（D） 壁厚（S） 冷拔管 钢管外径(mm) 允许偏差(mm) 钢管壁厚(mm) 允许偏差(mm) ＞114～159 ±0.8％ ≤30 ±10％ ＞159～219 ±1.0％ 热轧管 ＞219～457 ±1.0％ ≤20 －10％，＋12.5％ ＞20～40 －10％，＋10％ ＞457～1066 ±0.9％ ＞40～70 －7％，＋9％ ＞70～120 －6％，＋8％ Mechanical properties：
Standard codes
Models of steel tubes
Tensite strength（MPa）
Yield strength（MPa）
Yield ration
Elongation（％）
Absorbed-in-fracture energy（J）
Hardness
Q/321088HGB3
4130X
725～865
485～735
≤0.85
≥20
－40℃≥40
195～269HBChemical composition:
Standard codes
Models of steel tubes
Chemical compositions（％）
C
Si
Mn
P
S
Cr
Ni
Cu
Mo
V
Q/321088HGB3
4130X
0.25～0.35
0.15～0.35
0.40～0.90
≤0.020
≤0.010
0.80～1.10
≤0.25
≤0.20
0.15～0.25
≤0.08
www.sunnysteel.com
Tel.:+8621-3378 0199 Fax:+8621 5107 9722 MSN Online Consultation