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YB/T 4146 GCr15
YB/T 4146 GCr15SiMn
YB/T 4146 GCr18Mo
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YB/T 4146 High-carbon Chromium Bearing Steel Seamless Steel Tubes
Standard: YB/T 4146
Material: GCr15
Chemistry Composition
C, %
Si, %
Mn, %
P, %
S, %
Cr, %
Ni, %
Cu, %
Mo, %
0.08-0.15
0.17-0.37
0.40-0.70
0.025 max
0.015 max
0.40-0.70
0.30 max
0.20 max
0.40-0.55
Mechanical Properties
Tensile Strength , MPa
Yield Strength, MPa
Elongation, %
Impact (KV2)/J
Hardness (HBW)
410-560
205 min
21 min
40 (OD≥76mm & WT≥14mm)
156 max
Outside Diameter & Tolerance
Hot Rolled
Outside Diameter, mm
Tolerance
Ordinary
Advanced
OD≤54
±0.50mm
±0.30mm
54<OD≤325
±1%
±0.75%
OD>325
±1%
-
Cold Drawn
Outside Diameter, mm
Tolerance
Ordinary
Advanced
OD≤25.4
±0.15mm
-
25.4<OD≤40
±0.20mm
-
40<OD≤50
±0.25mm
-
50<OD≤60
±0.30mm
-
OD>60
±0.75%
±0.50%
Wall thickness & Tolerance
Hot Rolled
Wall Thickness, mm
Tolerance
Ordinary
Advanced
WT≤20
+15%/-10%
±10%
WT>20
+12.5%/-10%
±10%
Cold Drawn
Wall Thickness, mm
Tolerance
Ordinary
Advanced
WT≤3.0
±0.30mm
±0.20mm
WT>3
±10%
±7.5%
YB/T 4146 specifies the order content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of high-carbon chromium bearing steel seamless steel tubes. YB/T 4146 is suitable for manufacturing hot rolled and cold drawn (cold rolled) high-carbon chromium bearing steel seamless steel tubes for rolling bearing parts and other mechanical parts.
YB/T 4146规定了高碳铬轴承钢无缝钢管的订货内容、尺寸、外形、重量、技术要求、试验方法、检验规则、包装、标志和质量证明书。YB/T 4146适用于制造滚动轴承零件以及其他机械零件用热轧和冷拔(轧)高碳铬轴承钢无缝钢管。
Manufacture: tubes to GB 9948 shall be manufactured by hot rolled or cold drawn.
Heat Treatment: the tubes shall be produced by heat treated as normalizing & tempering.
Inspection & Test: chemistry composition analysis, tension test, flattening test or bending test, flaring test, hardness test (alloy & stainless), impact test, macroscopic examination, non-metallic inclusions, microstructure, intergranular corrosion test (stainless), NDT, surface inspection and dimension check.
Length: 4000mm; 6000mm; 9000mm; 12000mm; and so on.
Max developed length: 30 meters, also U bending, finning, studded process can be provided.
Option: shot blasting on the outside surface to remove mill scale, make the surface matte colour; surface polishing as preparation work done for further processing, for instance finning.
Keyword: GB T 9948, High Pressure Steel Pipe, Heat Exchanger Steel Tubes, Furnace Tubes, Piping
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