Seamless Steel Tube for Jacket Bracing

Standard:
YB/T5035
Standard of the Chinese metallurgical industry

Q/OHAD001-1997
Hengyang Company

Application:
For manufacturing of autosemi-shaft casing

Grade and Chemical composition (%)
Grade C Si Mn Cr Mo B Cu Ni P S
Max
45 0.42~0.50 0.17~0.37 0.5~0.8 ≤0.25 -- -- ≤0.25 ≤0.3 0.035 0.035
45Mn2 0.42~0.49 0.17~0.37 1.4~1.8 ≤0.3 ≤0.15 -- ≤0.25 ≤0.3 0.035 0.035
40MnB 0.37~0.44 0.17~0.37 1.1~1.4 ≤0.25 -- 0.0005~0.0035 ≤0.25 ≤0.3 0.035 0.035
40Cr 0.37~0.44 0.17~0.37 0.5~0.8 0.8~1.1 ≤0.15 -- ≤0.25 ≤0.3 0.035 0.035

Note: Drive shaft pipe of 25MnCr, 20Mn2, 30Mn2 can be provided as per agreement.

Dimension Tolerances:
Pipe OD and wall thickness allowed tolerances as per YB/T5035
Steel pipe supply conditions Pipe sizes Allowed tolerances
Classification Pipes delivered as per OD and WT OD ±1%
WT WT≤7mm
7mm<s≤15mm
</s≤15mm
WT>15mm
+15% -9% +12.5% -10% +12.5% -7.5%
Pipes delivered as per OD , ID and WT Outside diameter(D)
Inside diameter(d)
difference of wall thickness (ΔS)
±1.0% ±1.75% ≤15%
OD=77mm ID=57mm WT=10mm Outside diameter(D)
Inside diameter(d)
difference of wall thickness (ΔS)
+1.0mm -0.3mm +1.5mm -0.5mm ≤1.5mm
Note: Pipe wall thickness difference is the same cross-section of the difference between the maximum and minimum thickness

Pipe OD and WT tolerances as per Q/OHAD001-1997
Pipe sizes(mm) Allowed tolerances
OD ID WT
∮ 77 x 10 +1.0mm -0.3mm +1.5mm -0.5mm ≤1.4mm
∮ 83 x 11 ±0.9% ±1.75% ≤1.5mm
Note: Pipe wall thickness difference is the same cross-section of the difference between the maximum and minimum thickness
Mechanical Properties:
Item NO. Grade Mechanical Properties
Rm MPa Tensile Strength Rel MPa Yield Point A % Elongation HB Hardness
1 45 ≥590 ≥335 ≥14 --
2 45Mn2 -- -- -- 217~269
3 40MnB -- -- -- 217~269
4 40Cr -- -- -- 217~269
Size: YB/T5035 Range acc. YB/T5035
Nominal OD(mm) Nominal Wall Thickness (mm)
7 10 11 11.5 12 13 13.5 15 16 20 20.5 26 28.5
Kg/m
76 11.91
77 16.52
80 19.43
83 19.53
89 28.8
92 23.67
95 24.56 26.29
96 24.86 29.96
102 29.46
108 34.4
114 38.67 46.36 56.42 60.09
121 50.81
Note: Other sizes can also be provided as per agreement
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