GB/T 32957 20 Cold-drawn or Cold-rolled Precision Inside Diameter Seamless Steel Tubes for Hydraulic and Pneumatic System Service, ASTM A512, ASTM A822/A822M, EN 10305-1, 20, 45, 25Mn, Q345B, Q345C, Q345D, Q345E, 27SiMn

GB/T 32957 Cold-drawn or Cold-rolled Precision Inside Diameter Seamless Steel Tubes for Hydraulic and Pneumatic System Service

Standard: GB/T 32957
Equivalent Standards: ASTM A512, ASTM A822/A822M, EN 10305-1

Material: 20
Equivalent Material: 1020, St45.8

Chemistry Composition

C, %	Si, %	Mn, %	P, %	S, %	Cr, %	Ni, %	Cu, %
0.07-0.13	0.17-0.37	0.35-0.65	0.025 max	0.025 max	0.15 max	0.30 max	0.25 max

Mechanical Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %
335 min	205 min	24 min

Dimensions & Tolerance

Side Length (mm)	Tolerance
Side Length (mm)	Ordinary	Advanced
SL≤30mm	±0.30mm	±0.20mm
30mm＜SL≤50mm	±0.40mm	±0.30mm
50mm＜SL≤75mm	±0.80%	±0.70%
SL>75mm	±1%	±0.80%
Wall Thickness (mm)	Tolerance
Wall Thickness (mm)	Ordinary	Advanced
WT≤1mm	±0.18mm	±0.12mm
1mm＜WT≤3mm	+15%/-10%	+12.5%/-10%
WT>3mm	+12.5%/-10%	±10%

GB/T 32957 specifies the classification, code, order content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of cold drawn or cold rolled precision inside diameter seamless steel tubes for hydraulic and pneumatic system equipment. GB/T 32957 is applicable to cold drawn or cold rolled precision inside diameter seamless steel tubes for hydraulic and pneumatic system equipment with inside diameters ranging from 25mm to 500mm.
GB/T 32957规定了液压和气动系统设备用冷拔或冷轧精密内径无缝钢管的分类和代号、订货内容、尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志和质量证明书。GB/T 32957适用于内径尺寸25mm~500mm的液压和气动系统设备用冷拔或冷轧精密内径无缝钢管。

Manufacture: tubes to GB/T 3094 shall be manufactured by seamlesss process.
Delivery Condition: tubes should be delivered under cold finished condition, with purchaser agreement, it can also be with heat treated.
Inspection & Test: chemistry composition analysis, tensile test, surface inspection and dimension check.

Keyword: GB/T 3094, Shaped Steel Tubes, Cross-section Shaped

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