We specialize in the manufacture and supply of hot finished or cold finished stainless steel pipes and stainless steel tubes. Metline is a leading international supplier and manufacturer of stainless steel seamless pipes, stainless steel welded pipes, stainless steel pipe fittings and flanges. Our stainless steel seamless pipes can be offered in size ranges of 6mm – 630 mm * 0.5 – 40 mm and welded stainless steel pipes in size range 6mm – 914 mm * 0.5 – 70 mm, with various lengths according to the customers need.
Seamless & Welded Stainless Steel Pipes – ASTM A 312 TP304/304L, 316/316L/316Ti, 321H, 347H, 317L, 904L, 310S, DUPLEX
Our comprehensive stock of stainless steel pipes are in accordance with material specification ASTM A312 and dimensional specification ANSI/ASME B36.19M and ANSI/ASME B36.10M. Our extensive stocks of stainless steel seamless pipes and stainless steel welded pipes comprises of pipes and tubes in a size range of 6 NB (1⁄8”) to 600 NB (24”) in SCH 10 and SCH 40. Stainless steel seamless pipes are also available ex-stock in heavier schedules such as SCH 80S, SCH 160 and XXS.
Custom size large diameter fabricated stainless steel welded pipes can be offered with 100% X-Ray welding reports to meet the most challenging requirements of our customers. Our inventory includes stainless steel pipes and tubes in many grades including SS304, SS304L, SS321, SS321H, SS316L, SS347H, SS317L, Duplex 2205/UNS 31803, Super Duplex 2507, 904L and stainless steel 446.
Our high quality stainless steel pipes and stainless steel tube products exhibit greater corrosion resistance, high strength, durability, and machining ability. Stainless steel pipes and stainless steel tubes are most widely used in petrochemical plants, oil and gas equipments, heat exchanger equipment’s, sea water applications, pharmaceuticals, general fabrication purposes, chemical processing equipment, food and beverage industry and water treatments plants. Stainless steel pipes and tubes are used for water and oil and gas transmission as they can withstand harsh climatic conditions and high internal and external pressure.
In addition to standard size stainless steel pipes and stainless steel tubes, we specialise in providing our customers with custom size pipe and tube requirements through with the help of our extensive network of worldwide suppliers. Our commitment to provide our customers with best quality products has helped us become one of the biggest suppliers of stainless steel pipes and stainless steel tubes in India and international market.
Stainless Steel Seamless Pipes & Tubes
Metline Industries provides ex-stock supply of stainless steel seamless pipes per ASTM A312 in 304/304L, 316/316L/316Ti, 321H, SS347H, 317L, 904L and SS446 among other special grades. 304/304L stainless steel pipes/tubes and 316/316L stainless steel pipes/tubes are readily available in all standard pipe sizes and schedules including Sch 5, Sch 10, Sch 40s and Sch 80s. Stainless steel seamless tubes are available in compliance with ASTM A213 and ASTM A269 in common grades of such as 304/304L and 316/316L in standard tube sizes and wall thicknesses. We can offer custom size cold drawn stainless steel pipes and stainless steel tubes to our customers. Generally stainless steel pipes and stainless steel tubes are available in standard OD or NB sizes. However, with our tube processing capabilities we can offer any custom size outside diameter and thickness to our customers.
Stainless Steel Welded Pipes & Tubes
Metline Industries provides ex-stock supply of stainless steel welded pipes in accordance with ASTM A312 in common grades such as 304/304L and 316/316L in standard pipe sizes and schedules including Sch 5, Sch 10, Sch 40s and Sch 80s. Metline specialises in the supply of 100% X-Ray Welded custom sizes large diameter fabricated stainless steel pipes. All custom fabricated stainless steel pipe products are accompanied with X-Ray reports and chemical and physical properties certification from NABL approved labs. Specialty testing, including Hydro Testing, Destructive Test, and Non Destructive Test reports can be supplied upon customer request.
Stainless Steel Pipes, Stainless Steel Tubes Testing & Value Added Processing Services from METLINE
- Stainless Steel Pipe Polishing
- Stainless Steel Pipe Beveling
- Heat Treatment, Annealing, Pickling
- Ultrasonic Testing
- 100% X-Ray Welding for Large Diameter Custom Size Stainless Steel Pipes
- Tube Processing
- Special Testing Requirements – Destructive Testing, Non Destructive Testing etc.
Production, Supply, Stock Range of Stainless Steel Pipes and Stainless Steel Tubes
| Stainless Steel Pipe Manufacturing Grades |
| Austenite Stainless Steel Pipe Grades |
304/304L, 316/316L, 304H, 304LN, 316Ti, 310S, 904L, 317L, 321/321H, 347/347H |
| Martensite Stainless Steel Pipes Grades |
446, 410S |
| Duplex Stainless Steel Pipes Grades |
S31803, S32205, S32750, Duplex 2205, Super Duplex 2507 |
| Outside Diameter |
6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB available Ex-stock, OD Size Steel Tubes available Ex-stock |
| Thickness Range |
0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Type |
Seamless / ERW / Welded / Fabricated / CDW |
| Form |
Round Pipes/Tubes, Square Pipes/Tubes, Rectangular Pipe/Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes |
| Length |
Single Random, Double Random & Required Length End: Plain End, Beveled End, Treaded |
| End Protection |
Plastic Caps |
| Surface Finish: |
2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer Requirements |
| Delivery Condition |
Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| Inspection, Test Reports |
Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports |
| Packing |
Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests |
| Specials |
Sizes and Specifications other than above can be manufactured on request |
Chemical Composition of Stainless Steel Pipes, as per ASTM A312 Manufacturing Standard
The below table shows the chemical composition of the most used A312 Stainless Steel Pipes:
| A312 GRADES |
UNS |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
Ti |
Nb |
N |
| TP304 |
S30400 |
0.08 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
8.0-11.0 |
|
|
|
|
| TP304L |
S30403 |
0.035 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
8.0-13.0 |
|
|
|
|
| TP304H |
S30409 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
8.0-11.0 |
|
|
|
|
| TP304N |
S30451 |
0.08 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
8.0-18.0 |
|
|
|
0.10-0.16 |
| TP304LN |
S30453 |
0.035 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
8.0-12.0 |
|
|
|
0.10-0.16 |
| TP309S |
S30908 |
0.08 |
2 |
0.045 |
0.03 |
1 |
22.0-24.0 |
12.0-15.0 |
0.75 |
|
|
|
| TP309H |
S30909 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
22.0-24.0 |
12.0-15.0 |
|
|
|
|
| TP309Cb |
S30940 |
0.08 |
2 |
0.045 |
0.03 |
1 |
22.0-24.0 |
12.0-16.0 |
0.75 |
|
10xC min |
|
| 1.10 max |
| TP309HCb |
S30941 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
22.0-24.0 |
12.0-16.0 |
0.75 |
|
10xC min |
|
| 1.10 max |
| TP310S |
S3108 |
0.08 |
2 |
0.045 |
0.03 |
1 |
24.0-26.0 |
19.0-22.0 |
0.75 |
|
|
|
| TP310H |
S3109 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
24.0-26.0 |
19.0-22.0 |
|
|
|
|
| TP310Cb |
S31040 |
0.08 |
2 |
0.045 |
0.03 |
1 |
24.0-26.0 |
19.0-22.0 |
0.75 |
|
10xC min |
|
| 1.10 max |
| TP310HCb |
S31041 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
24.0-26.0 |
19.0-22.0 |
0.75 |
|
10xC min |
|
| 1.10 max |
| TP316 |
S3160 |
0.08 |
2 |
0.045 |
0.03 |
1 |
16.0-18.0 |
11.0-14.0 |
2.0-3.0 |
|
|
|
| TP316L |
S31603 |
0.035 |
2 |
0.045 |
0.03 |
1 |
16.0-18.0 |
10.0-14.0 |
2.0-3.0 |
|
|
|
| TP316H |
S31609 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
16.0-18.0 |
11.0-14.0 |
2.0-3.0 |
|
|
|
| TP316Ti |
S31635 |
0.08 |
2 |
0.045 |
0.03 |
0.75 |
16.0-18.0 |
10.0-14.0 |
2.0-3.0 |
5x |
|
0.1 |
| (C-N) |
| -0.7 |
| TP316N |
S31651 |
0.08 |
2 |
0.045 |
0.03 |
1 |
16.0-18.0 |
10.0-14.0 |
2.0-3.0 |
|
|
0.10-0.16 |
| TP316LN |
S31653 |
0.035 |
2 |
0.045 |
0.03 |
1 |
16.0-18.0 |
11.0-14.0 |
2.0-3.0 |
|
|
0.10-0.16 |
| TP317 |
S3170 |
0.08 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
10.0-14.0 |
3.0-4.0 |
|
|
|
| TP317L |
S31703 |
0.035 |
2 |
0.045 |
0.03 |
1 |
18.0-20.0 |
11.0-15.0 |
3.0-4.0 |
|
|
|
| TP321 |
S3210 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-12.0 |
|
|
|
0.1 |
| TP321H |
S32109 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-12.0 |
|
|
|
0.1 |
| TP347 |
S3470 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-13.0 |
|
|
|
|
| TP347H |
S34709 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-13.0 |
|
|
|
|
| TP347LN |
S34751 |
0.05-0.02 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-13.0 |
|
|
0.20- |
0.06-0.10 |
| 50 |
| TP348 |
S3480 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-13.0 |
|
|
|
|
| TP348H |
S34809 |
0.04-0.10 |
2 |
0.045 |
0.03 |
1 |
17.0-19.0 |
9.0-13.0 |
|
|
|
|
Mechanical Properties of Stainless Steel Pipes, as per ASTM A312
| ASTM A312 Mechanical Properties |
| Material |
Heat |
Temperure |
Tensile Strength |
Yield Strength |
Elongation %, Min |
| Treatment |
Min. |
Ksi (MPa), Min. |
Ksi (MPa), Min. |
|
º F(º C) |
|
|
| TP304 |
Solution |
1900 (1040) |
75(515) |
30(205) |
35 |
| TP304L |
Solution |
1900 (1040) |
70(485) |
25(170) |
35 |
| TP304H |
Solution |
1900 (1040) |
75(515) |
30(205) |
35 |
| TP310S |
Solution |
1900 (1040) |
75(515) |
30(205) |
35 |
| TP316 |
Solution |
1900(1040) |
75(515) |
30(205) |
35 |
| TP316L |
Solution |
1900(1040) |
70(485) |
25(170) |
35 |
| TP316H |
Solution |
1900(1040) |
75(515) |
30(205) |
35 |
| TP316Ti |
Solution |
1900(1040) |
75(515) |
30(205) |
35 |
| TP321 |
Solution |
1900(1040) |
75(515) |
30(205) |
35 |
| TP321H |
Solution |
Cold: 2000(1100) |
75(515) |
30(205) |
35 |
| Hot: 1925(1050) |
| TP347 |
Solution |
1900(1040) |
75(515) |
30(205) |
35 |
| TP347H |
Solution |
Cold: 2000(1100) |
75(515) |
30(205) |
|
| Hot: 1925(1050) |
|
Dimensions of Welded and Seamless Stainless Steel Pipe
| NPS |
Outside Diameter |
Nominal Wall Thickness |
| Designator |
in. |
mm |
Schedule 5S |
Schedule 10S |
Schedule 40S |
Schedule 80S |
|
in. |
mm |
in. |
mm |
in. |
mm |
in. |
mm |
| 1/8 |
0.41 |
10.29 |
… |
… |
0.049 |
1.24 |
0.068 |
1.73 |
0.095 |
2.41 |
| 1/4 |
0.54 |
13.72 |
… |
… |
0.065 |
1.65 |
0.088 |
2.24 |
0.119 |
3.02 |
| 3/8 |
0.68 |
17.15 |
… |
… |
0.065 |
1.65 |
0.091 |
2.31 |
0.126 |
3.2 |
| 1/2 |
0.84 |
21.34 |
0.065 |
1.65 |
0.083 |
2.11 |
0.109 |
2.77 |
0.147 |
3.73 |
| 3/4 |
4.05 |
26.67 |
0.065 |
1.65 |
0.083 |
2.11 |
0.113 |
2.87 |
0.154 |
3.91 |
| 1 |
1.32 |
33.4 |
0.065 |
1.65 |
0.109 |
2.77 |
0.133 |
3.38 |
0.179 |
4.55 |
| 1 1/4 |
1.66 |
42.16 |
0.065 |
1.65 |
0.109 |
2.77 |
0.14 |
3.56 |
0.191 |
4.85 |
| 1 1/2 |
1.90 |
48.26 |
0.065 |
1.65 |
0.109 |
2.77 |
0.145 |
3.68 |
0.2 |
5.08 |
| 2 |
2.38 |
60.33 |
0.065 |
1.65 |
0.109 |
2.77 |
0.154 |
3.91 |
0.218 |
5.54 |
| 2 1/2 |
2.88 |
73.03 |
0.083 |
2.11 |
0.12 |
3.05 |
0.203 |
5.16 |
0.276 |
7.01 |
| 3 |
3.50 |
88.9 |
0.083 |
2.11 |
0.12 |
3.05 |
0.1216 |
5.49 |
0.3 |
7.62 |
| 3 1/2 |
4.00 |
101.6 |
0.083 |
2.11 |
0.12 |
3.05 |
0.226 |
5.74 |
0.318 |
8.08 |
| 4 |
4.50 |
114.3 |
0.083 |
2.11 |
0.12 |
3.05 |
0.237 |
6.02 |
0.337 |
8.56 |
| 5 |
5.56 |
141.3 |
0.10*9 |
2.77 |
0.134 |
3.4 |
0.258 |
6.55 |
0.375 |
9.52 |
| 6 |
6.63 |
168.28 |
0.10*9 |
2.77 |
0.134 |
3.4 |
0.28 |
7.11 |
0.432 |
10.97 |
| 8 |
8.63 |
219.08 |
0.109 |
2.77 |
0.148 |
3.76 |
0.322 |
8.18 |
0.5 |
12.7 |
| 10 |
10.75 |
273.05 |
0.134 |
3.4 |
0.165 |
4.19 |
0.365 |
9.27 |
0.5 |
12.7 |
| 12 |
12.75 |
323.85 |
0.156 |
3.96 |
0.18 |
4.57 |
0.375 |
9.52 |
0.5 |
12.7 |
| 14 |
14.00 |
355.6 |
0.156 |
3.96 |
0.188 |
4.78 |
… |
… |
… |
… |
| 16 |
16.00 |
406.4 |
0.165 |
4.19 |
0.188 |
4.78 |
… |
… |
… |
… |
| 18 |
18.00 |
457.2 |
0.165 |
4.19 |
0.188 |
4.78 |
… |
… |
… |
… |
| 20 |
20.00 |
508 |
0.188 |
4.78 |
0.188 |
4.78 |
… |
… |
… |
… |
| 22 |
22.00 |
558.8 |
0.188 |
4.78 |
0.218 |
5.54 |
… |
… |
… |
… |
| 24 |
24.00 |
609.6 |
0.218 |
5.54 |
0.25 |
6.35 |
… |
… |
… |
… |
| 30 |
30.00 |
762 |
0.25 |
6.35 |
0.312 |
7.92 |
… |
… |
… |
… |
Outside Diameter Tolerance of Stainless Steel Pipes
| NPS |
ASTM A312 OD Tolerance |
| + |
– |
| inch |
mm |
inch |
mm |
| 1/8~1 1 /2 |
1/64(0.015) |
0.4 |
1/32(0.031) |
0.8 |
| > 1 1 /2~4 |
1/32(0.031) |
0.8 |
1/32(0.031) |
0.8 |
| > 4~8 |
1/16(0.062) |
1.6 |
1/32(0.031) |
0.8 |
| > 8~18 |
3/32(0.093) |
2.4 |
1/32(0.031) |
0.8 |
| > 18~26 |
1/8(0.125) |
3.2 |
1/32(0.031) |
0.8 |
| > 26~34 |
5/32(0.156) |
4 |
1/32(0.031) |
0.8 |
| > 34~48 |
3/16(0.187) |
4.8 |
1/32(0.031) |
0.8 |
Wall Thickness Tolerance of Stainless Steel Pipes
| NPS |
ASTM A312 WT Tolerance, % |
| + |
– |
| 1/8-2 1 /2 |
20 |
12.5 |
| 3~18, t/D≤ 5% |
22.5 |
12.5 |
| 3~18, t/D> 5% |
15 |
12.5 |
| ≥ 20, welded |
17.5 |
12.5 |
| ≥ 20, seamless, t/D≤ 5% |
22.5 |
12.5 |
| ≥ 20, seamless, t/D> 5% |
15 |
12.5 |
Stainless Steel Pipes Manufacturing Specifications
ASTM A312: Seamless and straight-seam welded austenitic pipe intended for high temperature and general corrosive service. Filler metal not permitted during welding.
ASTM A358: Electric fusion welded austenitic pipe for corrosive and/or high temperature service. Typically only pipe up to 8 inch is produced to this specification. Addition of filler metal is permitted during welding.
ASTM A790: Seamless and straight-seam welded ferritic/austenitic (duplex) pipe intended for general corrosive service, with a particular emphasis on resistance to stress corrosion cracking.
ASTM A409: Straight-seam or spiral-seam electric fusion welded large diameter austenitic light-wall pipe in sizes 14” to 30” with walls Sch5S and Sch 10S for corrosive and/or high
ASTM A376: Seamless austenitic pipe for high temperature applications.
ASTM A813: Single-seam, single- or double- welded austenitic pipe for high temperature and general corrosive applications.
ASTM A814: Cold-worked welded austenitic pipe for high temperature and general corrosive service.
Markings on Stainless Steel Pipes
The full identification of the pipe should be continuously marked down its whole length, including:
- Nominal Pipe Size (Nominal Bore)
- Schedule (Wall Thickness)
- Specification
- Grade
- Method of Manufacture (Seamless or Welded)
- Heat Number
- Manufacturer’s Name or Symbol – Optional
Example – ASTM A 312 Pipe 304 12″ NB SCH 40S SMLS HEAT NO. XXX
Export Destinations for Stainless Steel Pipes and Stainless Steel Tubes
Product reliability and performance has made Metline Industries a leading exporter and distributor of stainless steel pipes, stainless steel tubes and stainless steel tubing in India and international markets such as UAE, Bahrain, Indonesia, Malaysia, Mexico, Chile, Brazil, Peru, Nigeria, Kuwait, Jordan, Thailand (Bangkok), Venezuela, Iran, Germany, UK, Canada, Russia, Turkey, Australia, New Zealand, Sri Lanka, Vietnam, South Africa, Kazakhstan, Saudi Arabia. Our high quality steel pipes, good customer service, and in house pipes and tubes processing capabilities have made us one of the emerging suppliers for steel pipes and tubes in Middle East countries including Bahrain, Cyprus, Egypt, Iran, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Palestine, Qatar, Saudi Arabia, Syria, Turkey, United Arab Emirates and Yemen.
Domestic Supply Destinations for Stainless Steel Pipes and Stainless Steel Tubes
Our products are supplied to all major Industrial areas and cities in India such as Mumbai, Delhi, Bangalore, Hyderabad, Ahmedabad, Chennai, Kolkata, Surat, Pune, Nagpur, Indore, Thane, Bhopal, Visakhapatnam, Vadodra, Nashik, Faridabad, Rajkot, Aurangabad, Ranchi, Coimbatore, Raipur, Mysore, Bhubaneswar, Salem, Bhilai, Bhiwandi, Bikaner, Mangalore, Kochi (Cochin), Bhavnagar, Tirupur, Ankleshwar, Assam, Siliguri, Jamshedpur, Warangal, Nellore, Agartala and Thoothukudi
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