Welded Pipes & Tubes
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Welded Pipes & Tubes

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 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) 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) 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)
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)
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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