YB/T 4203 LZ20Mn2 Seamless Steel Tubes for Automobile Semi-trailer Axle, JIS G3441, LZ20Mn2, LZ27Mn2

YB/T 4203 Seamless Steel Tubes for Automobile Semi-trailer Axle

Standard: GB/T 4203
Equivalent Standards: JIS G3441

Material: LZ20Mn2

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%

YB/T 4203 specifies the size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of seamless steel tubes for automobile semi-trailer axles. YB/T 4203 is suitable for hot-rolled seamless steel pipes for automobile semi-trailer axles.
YB/T 4203规定了汽车半挂车轴用无缝钢管的尺寸、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。YB/T 4203适用于汽车半挂车轴用热轧无缝钢管。

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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