YB/T 4399 TQ345B High Performance Shaped Seamless Steel Tubes for Tower Framework, ASTM A500/A500M, JIS G3474, TQ345B, TQ345C, TQ345D, TQ345E, TQ450C, TQ450D, TQ450E, TQ500C, TQ500D, TQ500E, TQ590C, TQ590D, TQ590E, TQ700E, TQ800E, TQ900E

YB/T 4399 High Performance Shaped Seamless Steel Tubes for Tower Framework

Standard: YB/T 4399
Equivalent Standards: ASTM A500/A500M, JIS G3474

Material: TQ345B

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 4399 specifies the classification, code, order content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of high performance shaped seamless steel tubes for tower framework. YB/T 4399 is suitable for high performance shaped seamless steel pipes used in construction, communication towers, power towers, aerospace launch towers and other towers.
YB/T 4399规定了塔架用高性能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 4399适用于建筑、通信铁塔、电力铁塔、航空航天发射塔等塔架用高性能异型无缝钢管。

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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