PRODUCTS

Stainless steel welded pipe

ꁆ ꁇ

HOME ꄲ PRODUCTS ꄲ product details

Stainless steel welded pipe, abbreviated as welded pipe, is commonly used as a steel pipe made by welding steel or steel strip after being rolled and formed by the machine and mold. The production process of welded steel pipes is simple, with high production efficiency, multiple varieties and specifications, and less equipment investment, but the general strength is lower than that of seamless steel pipes.

Mainly used for machinery, cars, bicycles, furniture, hotel and restaurant decoration, and other mechanical components and structural components

Since the 1930s, with the rapid development of high-quality strip steel continuous rolling production and the progress of welding and inspection technology, the quality of welds has been continuously improved, and the variety and specifications of welded steel pipes have been increasing. In more and more fields, especially in heat exchange equipment pipes, decorative pipes, medium and low pressure fluid pipes, seamless steel pipes have been replaced.

Advantage for welded pipe

mall diameter stainless steel welded pipes are produced continuously online. The thicker the wall thickness, the greater the investment in the unit and welding equipment, and the less economical and practical they are. The thinner the wall thickness, the corresponding decrease in its input-output ratio;
Secondly, the process of this product determines its advantages and disadvantages. Generally, the welded steel pipe has high precision, uniform wall thickness, high surface brightness inside and outside the pipe (the surface brightness of the steel pipe is determined by the surface grade of the steel plate), and can be arbitrarily sized. Therefore, it reflects its economy and aesthetics in high-precision, medium and low pressure fluid applications.

Classification for welded pipe

According to welding technology: It can be divided into automatic welding and manual welding. Automatic welding generally adopts submerged arc welding and plasma welding, while manual welding generally adopts argon arc welding.
According to the form of welding seam: It is divided into straight seam welded pipe and spiral welded pipe.
According to applications: It can be divided into general welded pipes, heat exchanger pipes, condenser pipes, galvanized welded pipes, oxygen blown welded pipes, wire sleeves, metric welded pipes, roller pipes, deep well pump pipes, automotive pipes, transformer pipes, welded thin-walled pipes, welded special shaped pipes, and spiral welded pipes according to their purposes.

The corresponding standard size

Inch	DN (mm)	OD (mm)	SCH5S	SCH10S	SCH10	SCH20	SCH30	SCH40	SCH60	SCH80	SCH100	SCH120	----
1/8	DN6	10.3		1.24				1.73		2.42
1/4	DN8	13.7		1.65				2.24		3.02
3./8	DN10	17.1		1.65				2.31		3.2
1/2	DN15	21.3	1.65	2.11				2.77		3.73
3/4	DN20	26.7	1.65	2.11				2.87		3.91
1	DN25	33.4	1.65	2.77				3.38		4.55
1 1/4	DN32	42.2	1.65	2.77				3.56		4.85
1 1/2	DN40	48.3	1.65	2.77				3.68		5.05
2	DN50	60.3	1.65	2.77				3.91		5.54
2 1/2	DN65	73.0	2.11	3.05				5.16		7.01
3	DN80	88.9	2.11	3.05				5.49		7.62
3 1/2	DN90	101.6	2.11	3.05				5.74		8.08
4	DN100	114.3	2.11	3.05				6.02		8.58		11.13
5	DN125	141.3	2.77	3.4				6.55		9.53		12.7
6	DN150	168.3	2.77	3.4				7.11		10.97		14.27
8	DN200	219.1	2.77	3.76		6.35	7.04	8.18	10.31	12.7	15.09	18.26
10	DN250	273.1	3.40	4.19		6.35	7.8	9.27	12.7	15.09	18.26	21.44
12	DN300	323.9	3.96	4.57		6.35	8.38	10.31	14.27	17.48	21.44	25.4
14	DN350	355.5	3.96	4.78	6.35	7.92	9.53	11.13	15.09	19.05	23.83	27.79
----

Commonly available processed grade

GRADE	GB/T 1220-2007	ASTM	UNS	DIN	JIS	KS
奥氏体不锈钢（Austenitic）	12Cr17Mo6Ni5N	201	S20100	1.4372	SUS201	STS201
	06Cr19Ni10	304	S30400	1.4301	SUS304	STS304
	022Cr19Ni10	304L	S30403	1.4306	SUS304L	STS304L
	06Cr23Ni13	309S	S30908	1.4833	SUS309S	STS309S
	06Cr25Ni20	310S	S31008	1.4845	SUS310S	STS310S
	022Cr17Ni12Mo	316L	S31603	1.4404	SUS316L	STS316L
	06Cr19Ni11Ti	321	S32100	1.4541	SUS321	STS321

Chemical composition and Mechanical properties

牌号 Grade		C(%)	Si(%)	Mn(%)	P(%)	S(%)	Cr(%)	Ni(%)	N(%)	Mo(%)
奥氏体 Austenitic	201	≤0.15	≤1.00	5.50-7.50	≤0.06	≤0.03	16.00-18.00	0.50-1.00	≤0.25	-
	304	≤0.08	≤1.00	≤2.00	≤0.045	≤0.03	18.00-20.00	8.00-10.50	≤1.00	-
	304L	≤0.03	≤1.00	≤2.00	≤0.045	≤0.03	18.00-20.00	8.00-12.00	≤1.00	-
	321	≤0.08	≤1.00	≤2.00	≤0.045	≤0.03	17.00-19.00	9.00-12.00	≤1.00	-
	316L	≤0.03	≤1.00	≤2.00	≤0.045	≤0.03	16.00-18.00	10.00-14.00	≤1.00	2.00-3.00
	309S	≤0.08	≤1.00	≤2.00	≤0.045	≤0.03	22.00-24.00	12.00-15.00	-	-
	310S	≤0.08	≤1.50	≤2.00	≤0.045	≤0.03	24.00-26.00	19.00-22.00	-	-

牌号 Grade		TS (Mpa)	YS (Mpa)	EL ( %)	Rate of reduction in area (%)	Density (g/cm³）	Hardness (HB / HRB / HV)
奥氏体 Austenitic	201	≥520	≥275	50-60	≥60	7.93	≤187HB / ≤90HRB / ≤200HV
	304	515-1035	≥205	≥40	≥60	7.93	≤201HBW / ≤92HRB / ≤210HV
	304L	≥520	≥205	≥40	≥60	7.93	≤187HB / ≤90HRB / ≤200HV
	321	≥520	≥205	≥50	≥40	7.98	≤187HB / ≤90HRB / ≤200HV
	316L	≥480	≥177	≥40	≥60	7.98	≤187HB / ≤90HRB / ≤200HV
	309S	≥515	≥205	≥40	≥50	7.98	≤187HB
	310S	≥515	≥205	≥40	≥50	7.98	≤187HB