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YB/T 4146 High-carbon Chromium Bearing Steel Seamless Steel Tubes |
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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 |
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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 |
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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% |
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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% |
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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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