YB/T 4400 CQ245B Shaped Seamless Steel Tubes for Automobile Framework, ASTM A500/A500M, CQ245B, CQ245C, CQ245D, CQ245E, CQ345B, CQ345C, CQ345D, CQ345E, CQ450B, CQ450C, CQ450D, CQ450E, CQ500C, CQ500D, CQ500E

YB/T 4400 Shaped Seamless Steel Tubes for Automobile Framework

Standard: YB/T 4400
Equivalent Standards: ASTM A500/A500M

Material: CQ245B

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 4400 specifies the classification, code, order content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of shaped seamless steel pipes for automobile framework. YB/T 4400 is suitable for shaped seamless steel pipes for automobile structures.
YB/T 4400规定了汽车结构用异型无缝钢管的分类、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。YB/T 4400适用于汽车结构用异型无缝钢管。

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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