Stainless Welded Pipes & Tubes-Tsisco

Stainless Welded Pipes & Tubes

Stainless Steel Welded Pipes & Tubes

1) Overview

Stainless steel welded pipes are manufactured from stainless steel plates or strips by forming and welding (TIG, ERW, Laser, Plasma).
Compared with seamless pipes, welded pipes offer higher production efficiency, wider size range, uniform wall thickness, and better cost performance, making them widely used in petrochemical, heat exchangers, food & pharmaceutical, fluid transport, architectural decoration, and machinery manufacturing.

2) Manufacturing Process
   •Raw material: hot rolled or cold rolled stainless steel coil/plate
   •Forming: roll forming or cold bending
   •Welding methods: TIG, ERW, laser, plasma welding
   •Heat treatment: solution annealing, bright annealing (BA)
   •Surface finishing: pickling, mechanical polishing, mirror finish
   •Inspection: 100% eddy current / ultrasonic, X-ray on request

3) Key Features
   •Uniform wall thickness: ideal for large diameter thin-wall pipes
   •Wide size range: diameter up to DN2000
   •Excellent corrosion resistance: suitable for acidic, alkaline, chloride environments
   •Surface options: pickled, BA bright, polished, mirror finish
   •Cost-effective: especially suitable for large size and non-high pressure use
   •Good workability: suitable for bending, drilling, welding

4) Standards

(Stainless welded pipes only)
   •ASTM/ASME: A249, A269, A270, A312, A358, A554, A778, A789, A790
   •EN/DIN: EN 10217-7, EN 10312, DIN 17457
   •JIS: JIS G3447, JIS G3459
   •GB/T: GB/T 12771, GB/T 19228

5) Grades
   •Austenitic SS: 304, 304L, 316, 316L, 321, 310S
   •Duplex SS: 2205, 2507
   •Super Austenitic: 904L, 254SMo
   •Ferritic SS: 409L, 410, 430
   •Decorative grades: 201, 202

6) Applications
   •Petrochemical: corrosion-resistant piping, heat exchanger tubes
   •Food & Pharmaceutical: sanitary pipes (ASTM A270), water supply, pharma equipment
   •Architecture: curtain walls, railings, handrails, furniture, structural parts
   •Energy & Power: boiler tubes, condenser tubes, heat exchanger tubing
   •Machinery: bearing housings, structural tubing, fluid transport lines
   •Automotive: exhaust systems, decorative trims

7) Quality & Testing
   •Chemical composition analysis (spectrometer)
   •Mechanical testing (tensile, hardness, impact)
   •Weld inspection: 100% eddy current, ultrasonic, X-ray (if required)
   •Pressure tests: hydrostatic / pneumatic
   •Surface inspection: finish quality, weld bead uniformity
   •Third-party approvals: TÜV, SGS, LR, BV

8) Supply & Packaging
   •Forms: straight pipes (fixed/double length), coiled tubing
   •Ends: plain end, beveled end, threaded
   •Packaging: plastic end caps, waterproof wrapping, wooden cases, strapped bundles
   •Traceability: MTC (EN 10204 3.1/3.2)

9) Ordering Guide
   •Grade (e.g., 316L / ASTM A269)
   •Dimensions (OD × WT × Length)
   •Surface finish (pickled / BA bright / polished)
   •Inspection requirements (NDT weld, hydro test, third-party witness)
   •Packaging (wooden cases, anti-rust film, export pallets)
   •End-use (decorative / pressure service / sanitary / chemical piping)

10) Why Us
   •Full product range: precision small diameter to large diameter heavy wall welded pipes
   •Advanced welding: TIG, ERW, Laser, Plasma welding capability
   •Certified quality: ASTM, EN, GB, JIS compliance with third-party inspection
   •Multi-industry applications: petrochemical, energy, food, architecture, machinery, automotive
   •One-stop solution: integrated supply of plates, bars, seamless pipes, fittings & flanges

1. General specifications:

Size：	O.D.9.9mm to O.D. 2000mm; W.T. 0.4mm to 25mm.
Application：	Chemical, pulp, water treat, food, automobile, oil & gas, petrochemical equipment, onshore and offshore poject.
Standards：	GB, ASTM ASME A/SA 312, A/SA 778, JIS G 3459, GB/T 12771, ASTM ASME A/SA 249, ASTM ASME A/SA 358, ASTM ASME A/SA 688, ASTM ASME A/SA 789, ASTM ASME SA/790, ASTM A 269
Materials:	304, 304L, 316, 316L, 31803, 32750, 32760, 32205

2. Stainless steel pipe:
ASTM A312, ASTM A358, ASTM A778

Outside diameter		O.D.(mm)	Thickness
N.B.	NPS	O.D.(mm)	SCH 5S(mm)	SCH10S(mm)	SCH40S(mm)
8	1/4"	13.72	-	-	2.24
10	3/8"	17.15	-	-	2.31
15	1/2"	21.34	1.65	2.11	2.77
20	3/4"	26.67	1.65	2.11	2.87
25	1"	33.40	1.65	2.77	3.38
32	11/4"	42.16	1.65	2.77	3.56
40	11/2"	48.26	1.65	2.77	3.68
50	2"	60.33	1.65	2.77	3.91
65	21/2"	73.03	2.11	3.05	5.16
80	3"	88.90	2.11	3.05	5.49
90	31/2"	101.60	2.11	3.05	5.74
100	4"	114.30	2.11	3.05	6.02
125	5"	141.30	2.77	3.40	6.55
150	6"	168.28	2.77	3.40	7.11
200	8"	219.08	2.77	3.76	8.18
250	10"	273.05	3.40	4.19	9.27
300	12"	323.85	3.96	4.57	9.52

JIS G3459

Outside diameter		O.D.(mm)	Thickness
(A)	(B)	O.D.(mm)	SCH 5S(mm)	SCH10S(mm)	SCH20S(mm)	SCH40S(mm)
8	1/4"	13.8	1.2	1.65	2.0	2.2
10	3/8"	17.3	1.2	1.65	2.0	2.3
15	1/2"	21.7	1.65	2.1	2.5	2.8
20	3/4"	27.2	1.65	2.1	2.5	2.9
25	1"	34.0	1.65	2.8	3.0	3.4
32	11/4"	42.7	1.65	2.8	3.0	3.6
40	11/2"	48.6	1.65	2.8	3.0	3.7
50	2"	60.5	1.65	2.8	3.5	3.9
65	21/2"	76.3	2.1	3.0	3.5	5.2
80	3"	89.1	2.1	3.0	4.0	5.5
90	31/2"	101.6	2.1	3.0	4.0	5.7
100	4"	114.3	2.1	3.0	4.0	6.0
125	5"	139.8	2.8	3.4	5.0	6.6
150	6"	165.2	2.8	3.4	5.0	7.1
200	8"	216.3	2.8	4.0	6.5	8.2
250	10"	267.4	3.4	4.0	6.5	9.3
300	12"	318.5	4.0	4.5	6.5	10.3

3. Large diameter stainless steel pipe(O.D. can be made up to 80"):
ASTM A312, ASTM A358, ASTM A409, CNS 13517 G3259, JIS G3468

Outside diameter		O.D.(mm)	Thickness
(A)	(B)	O.D.(mm)	SCH 5S(mm)	SCH10S(mm)	SCH20(mm)	SCH40(mm)
350	14"	355.6	4.0	5.0	8.0	11.1
400	16"	406.4	4.5	5.0	8.0	12.7
450	18"	457.2	4.5	5.0	8.0	14.3
500	20"	508.0	5.0	5.5	9.5	15.1
550	22"	558.8	5.0	5.5	9.5	15.9
600	24"	609.6	5.5	6.5	9.5	17.5
650	26"	660.4	5.5	8.0	12.7	17.5
700	28"	711.2	5.5	8.0	12.7	17.5
750	30"	762.0	6.5	8.0	12.7	17.5
800	32"	812.8	-	8.0	12.7	17.5
850	34"	863.6	-	8.0	12.7	17.5
900	36"	914.4	-	8.0	12.7	19.1
1000	40"	1016.0	-	9.5	14.3	26.2

4. Stainless steel tube for boiler, heat-exchanger and feedwater heater:
ASTM A249, ASTM A269, ASTM A688, CNS 7383 G3142, JIS G3463

Outside diameter (mm)	Thickness(mm)
Outside diameter (mm)	1.6	2.0	2.3	2.6	2.9	3.2	3.5	4.0	4.5	5.0
15.9		○	○	○	○	○	○	○	○	○
19.0			○	○	○	○	○	○	○	○
21.7						○	○	○	○	○
25.4						○	○	○	○	○
27.2						○	○	○	○	○
31.8						○	○	○	○	○
34.0								○	○	○
38.1								○	○	○
42.7								○	○	○
48.6								○	○	○
50.8									○	○
60.3									○	○
63.5									○	○
76.2
88.9	○
101.6	○
114.3	○	○	○	○
139.8	○	○	○	○

5. Stainless steel mechanical tube:
ASTM A554, CNS 5802 G3119, JIS G3446

Outside diameter (mm)	Thickness(mm)
Outside diameter (mm)	0.7	0.8	0.9	1.0	1.2	1.5	2.0	3.0
12.7							○	○
15.9							○	○
19.0							○	○
22.2							○	○
25.4							○	○
28.6	○	○					○	○
31.8	○	○
38.1	○	○
50.8	○	○	○	○
63.5	○	○	○	○
76.2	○	○	○	○	○
88.9	○	○	○	○	○	○
101.6	○	○	○	○	○	○
114.3	○	○	○	○	○	○	○

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