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Carburizing Seamless Type Automotive Steel Tubes ASTM A534 Grade B20 B21

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City: Ningbo
Province/State: Zhejiang
Country/Region: China
Tel: 86-574-88086983
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Mr Richard SHEN

Carburizing Seamless Type Automotive Steel Tubes ASTM A534 Grade B20 B21

Brand Name : Torich
Place of Origin : China
Payment Terms : L/C, T/T
Model Number : ASTM A534
Certification : ISO 9001 ISO14001
MOQ : 1 ton
Delivery Time : 60-90days
Packaging Details : In export packaging
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Carburizing Seamless Type Automotive Steel Tubes ASTM A534 Grade B20 B21


Carburizing Steels for Anti-Friction Bearings


Size:OD 4-520mm WT 0.5-50mm L:3-6m

Application:Bear


Chemical Composition
Number CNameCMnP (max)S (max)SiCrNiMoCu (max)O (max)DAl (max)
. . .4118H0.17 -0.230.60 -1.000.0250.0150.15 -0.350.30 -0.70. . .0.08 -0.150.30.0020.05
. . .4320H0.17 -0.230.40 -0.700.0250.0150.15 -0.350.35 -0.651.55 -2.000.20 -0.300.30.0020.05
. . .4620H0.17 -0.230.35 -0.750.0250.0150.15 -0.35. . .1.55 -2.000.20 -0.300.30.0020.05
. . .4720H0.17 -0.230.45 -0.750.0250.0150.15 -0.350.30 -0.600.85 -1.250.15 -0.250.30.0020.05
. . .4817H0.14 -0.200.30 -0.700.0250.0150.15 -0.35. . .3.20 -3.800.20 -0.300.30.0020.05
. . .4820H0.17 -0.230.40 -0.800.0250.0150.15 -0.35. . .3.20 -3.800.20 -0.300.30.0020.05
. . .5120H0.17 -0.230.60 -1.000.0250.0150.15 -0.350.60 -1.00. . .. . .0.30.0020.05
. . .8617H0.14 -0.200.60 -0.950.0250.0150.15 -0.350.35 -0.650.35 -0.750.15 -0.250.30.0020.05
. . .8620H0.17 -0.230.60 -0.950.0250.0150.15 -0.350.35 -0.650.35 -0.750.15 -0.250.30.0020.05
. . .9310H0.07 -0.130.40 -0.700.0250.0150.15 -0.351.00 -1.452.95 -3.550.08 -0.150.30.0020.05
B2020Cr30.17 -0.230.60 -1.000.0250.0150.40 max0.60 -1.00. . .. . .0.30.0020.05
B2120Cr40.17 -0.230.60 -0.900.0250.0150.40 max0.90 -1.20. . .. . .0.30.0020.05
B2220MnCr4-20.17 -0.230.65 -1.100.0250.0150.40 max0.40 -0.75. . .. . .0.30.0020.05
B2317MnCr50.14 -0.191.00 -1.300.0250.0150.40 max0.80 -1.10. . .. . .0.30.0020.05
B2419MnCr50.17 -0.221.10 -1.400.0250.0150.40 max1.00 -1.30. . .. . .0.30.0020.05
B2515CrMo40.12 -0.180.60 -0.900.0250.0150.40 max0.90 -1.20. . .0.15 -0.250.30.0020.05
B2620CrMo40.17 -0.230.60 -0.900.0250.0150.40 max0.90 -1.20. . .0.15 -0.250.30.0020.05
B2720MnCrMo4-20.17 -0.230.65 -1.100.0250.0150.40 max0.40 -0.75. . .0.10 -0.200.30.0020.05
B2820NiCrMo20.17 -0.230.60 -0.950.0250.0150.40 max0.35 -0.650.40 -0.700.15 -0.250.30.0020.05
B2920NiCrMo70.17 -0.230.40 -0.700.0250.0150.40 max0.35 -0.651.60 -2.000.20 -0.300.30.0020.05
B3018CrNiMo7-60.15 -0.210.50 -0.900.0250.0150.40 max1.50 -1.801.40 -1.700.25 -0.350.30.0020.05
B3118NiCrMo14-60.15 -0.200.40 -0.700.0250.0150.40 max1.30 -1.603.25 -3.750.15 -0.250.30.0020.05
B3216NiCrMo16-50.14 -0.180.25 -0.550.0250.0150.40 max1.00 -1.403.80 -4.300.20 -0.300.30.0020.05

Inclusion Rating
Rating Units
Thin SeriesHeavy Series
A-2 1/2A-1 1/2
B-2B-1
C-1/2C-1/2
D-1D-1


Decarburrization and surface imperfections for coils anf bars for balls and rollers
size,in.(mm)Decarburization or Surface Imperfections per Side,max,in.(mm)
Hot-Rolled or Hot Rolled AnnealedCold-Finished
Through 0.250(6.35)0.005(0.13)0.003(0.08)
Over 0.250(6.35)-0.500(12.7),Incl0.006(0.15)0.004(0.10)
Over 0.500(12.7)-0.750(19.1),Incl0.008(0.20)0.006(0.15)
Over 0.750(19.1)-1.000(25.4),Incl0.010(0.25)0.008(0.20)

Decarburization and Surface Imperfections for Bars and Tubes
size,In.(mm)Decarburization or Surface Imperfections per Side,Max,in.(mm)
Hot-Rolled barsAnnealedCold-Finished
BarsTubesBarsTubes
Through 1.000(25.4)0.012(0.31)0.015(0.38)0.012(0.31)0.012(0.31)0.010(0.21)
Over 1.000(25.4)-2.000(50.8),Incl0.017(0.43)0.022(0.56)0.020(0.51)0.015(0.38)0.014(0.36)
Over 2.000(50.8)-3.000(76.2),Incl0.025(0.64)0.030(0.76)0.030(0.76)0.025(0.64)0.019(0.48)
Over 3.000(76.2)-4.000(101.6),Incl0.035(0.89)0.045(1.14)0.035(0.89)0.024(0.61)
Over 4.000(101.6)-5.000(127.0),Incl0.055(1.40)0.065(1.65)0.040(1.02)0.028(0.71)

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