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Steel pipe outside diameter(OD) and wall thickness(WT) standard

NOMINAL PIPE SIZE		OUTSIDE DIAMETER			NOMINAL WALL THICKNESS
A	B	ASME	JIS	DIN	JIS(1)	DIN(2)	SCH40	SCH80
15	1/2〞	21.3	21.7	21.3	2.8	2.0		3.73
20	3/4	26.7	27.2	26.9	2.8	2.3	2.87	3.91
25	1	33.4	34.0	33.7	3.2	2.6	3.38	4.55
32	1.1/4	42.2	42.7	42.4	3.5	2.6	3.56	4.85
40	1.1/2	48.3	48.6	48.3	3.5	2.9	3.68	5.08
50	2	60.3	60.5	60.3	3.8	2.9	3.91	5.54
65	2.1/2	73.0	76.3	76.1	4.2	2.9	5.16	7.01
80	3	88.9	89.1	88.9	4.2	3.2	5.49	7.62
90	3.1/2	101.6	101.6		4.2		5.74	8.08
100	4	114.3	114.3	114.3	4.5	3.6	6.02	8.56
125	5	141.3	139.8	139.7	4.5	4.0	6.55	9.53
150	6	168.3	165.2	168.3	5.0	4.5	7.11	10.97
200	8	219.1	216.3	219.1	5.8	6.3	8.18	12.70
250	10	273.0	267.4	273.0	6.6	6.3	9.27	15.09
300	12	323.8	318.5	323.9	6.9	7.1	10.31	17.48
350	14	355.6	355.6	355.6	7.9	8.0	11.13	19.05

Product Description

▊ Tianyingtai（TYT） is committed to long-term development, creating high-quality products and services, with the same pursuit of quality and service, stable, strong, long-term cooperation raw material suppliers, such as Haigang, Yurunde, etc., to maximize the consistency and stability of materials, product appearance and internal quality.

▊ Raw materials grade : Q195, Q235B and Q345...

▊ High-frequency straight seam welded steel pipe is also called straight seam high-frequency electric resistance welded steel pipe. Its characteristics are: high welding speed, small welding heat affected zone, welding can not clean the work piece, weld thin wall pipe, weldable metal pipe.

▊ The high-frequency resistance welded steel pipe is different from the ordinary welded pipe welding process. The welded joint is made of the base material of the steel strip body, and the mechanical strength is better than that of the general welded pipe. The surface is smooth, high precision, low cost and low weld seam height, which is beneficial to the coating of 3PE anti-corrosion coating.

▊ The welding method of high-frequency welded steel pipe and submerged arc welded pipe is significantly different. Since the welding is done instantaneously at high speed, the difficulty in ensuring the welding quality is much higher than that in the submerged arc welding method.

▊ In November 2014, it was recognized as “Tianjin Famous Trademark” by Tianjin Market and Quality Supervision Committee. The steel pipe produced and sold by the company was rated as “Tianjin Famous Brand Product” by Tianjin Municipal Government. and keep for many years.

Technical Specification

Products	ERW black steel pipe
Specification	OD	21-406.4mm
	WT	0.8 - 20mm
	Length	1-12m
Steel grades	Q195, Q235A-B, Q345A-E, 20#, 10#,16Mn, ASTM A36,ASTM A500, ASTM A53, ASTM 106, SS400, St37, St52, S235JR, S355TRH etc
Standards	GB/T 3091-2001,GB/T13912-2002, BS 1387, ASTM F1083 etc.
Pipe ends	plain, beveled, threaded, socket with holes, with PVC clap/ coupling/ clamp, or as customers’ requirement
treatment
Application	liquid delivery (pump well, gas, water), construction pipe, structural pipe(greenhouse structure, fence post), curtain wall, machinery part etc.
Package	in bundle, no other package or wrapped with waterproof, or as customers’ requirement
Delivery Time	10days from stock; 20-30days produced according to the quantity
Payment Term	T/T or L/C
Price Term	CIF; CFR; FOB Tianjin, China; EXW
Loading Port	Tianjin, China
MOQ	One container
Others	1.All the pipes is high-frequency welded.
	2.Both inner and outer welded stab can be removed.
	3.Special design available according to requirement.
	4.Pipe can be necked down and punched holes.
	5.Supplying BV or SGS Inspection if client need.

Packaging & Shipping

We have professional shipping agent for all the transportation of our products. Products will be packed in bags,box,or in other way as discussed, then in container. Products will be transported from factory to shipping port by truck. Finally it will be loaded on ship to destination. You will be able to track the shipment in any time.

For pipes : 1. by bundles, each bundle weight under 3 tons, for small outer diameter seamless steel pipe, each bundle with 4 - 8 steel strips. 2. after making by bundle, covered with Polyethylene waterproof cloth. 3. make black paints painting or as discussed on each pipe, then make bundles

ERW black steel pipe erw round tube