Seamless Stainless Steel Pipe

Forever Steel Manufacturing Co., Ltd
seamless stainless steel pipe,stainless seamless pipe,ASTM A312 pipe,304 stainless steel pipe,316L stainless steel pipe

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Seamless Stainless Steel Pipe

SS seamless pipe
ASTM A312 TP316L stainless steel seamless pipe with pickled and annealed finish
High precision 304 stainless steel seamless tubing for chemical and food industry
Tubería de acero inoxidable sin costura TP304L con inspección de calidad visual
Visual inspection of stainless steel seamless pipe surface for zero-defect quality

Product Name: Seamless Stainless Steel Pipe
OD Range: 6 mm - 762 mm, 1/4" - 30"
Wall Thickness: 0.5 mm - 65 mm, SCH 5S - SCH XXS
Length: 5.8 m, 6 m, 11.8 m, 12 m or custom length
Surface: Pickled, bright annealed (BA), polished
Process: Cold drawn, cold rolled, hot rolled
Standards: ASTM A312, ASTM A213, ASTM A269, ASTM A789, ASTM A790, ASME SB163, ASME SB444, ASTM B677, ASTM A928
Grades: 304, 304L, 316, 316L, 310S, 321, 347H, S31803, S32205, S32750, S32760
Applications: Boilers, heat exchangers, power generation, offshore engineering, petrochemical, refineries, chemical processing, water treatment, mining, pharmaceutical, food and beverage, sanitary systems


  • Overview
  • Specification
  • Standard
  • Process
  • FAQ

Seamless Stainless Steel & Nickel Alloy Pipes

Forever Steel supplies seamless stainless steel pipes for chemical processing, heat exchange, water treatment, food and beverage, pharmaceutical and general industrial piping applications. Common grades include 304/304L, 316/316L, 321, 347H, 310S and duplex stainless steel grades such as S31803 and S32205. Buyers should confirm the standard, grade, outside diameter, wall thickness, surface finish, length, testing requirements and required documents before quotation.


1. Comprehensive Technical Specifications

Our production line covers a vast range of dimensions to meet the precise requirements of global engineering projects:

Outside Diameter (OD):6mm to 762mm (1/4" to 30")

Wall Thickness (WT):0.5mm to 65mm (SCH 5S to SCH XXS)

Length: 5.8m, 6m, 11.8m, 12m, or customized up to 20m.

Manufacturing Processes:Cold Drawn, Cold Rolled, Precision Rolled, and Hot Rolled.

Surface Finishes:Pickled & Annealed, Bright Annealing (BA), and Polished (Mirror/Satin).


2. Industry Standards & Material Grades

We strictly adhere to international quality benchmarks, providing Material Test Certificates (MTC)according to EN 10204 3.1/3.2 for every shipment.

Seamless Stainless Steel Pipe Specifications and Size Range

Standard

Dimension

Steel Grade

ASTM A312

OD: 1/4"-20"
WT: SCH5S-SCH80S

TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti,
TP317, TP317L, TP321, TP321H, TP347, TP347H, S31254, 904L

ASTM A213

OD: 6.0-50.8mm
WT: 0.8-10.0mm

TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti,
TP317, TP317L, TP321, TP321H, TP347, TP347H, S31254, 904L

ASTM A269

OD: 6.0-50.8mm
WT: 0.8-10.0mm

TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti,
TP317, TP317L, TP321, TP321H, TP347, TP347H, S31254

ASTM A789

OD: 19.0-60.5mm
WT: 1.2-5.0mm

S31803, S32205, S32750,S32760

ASTM A790

OD: 3/4"-10"
WT: SCH5S-SCH80S

S31803, S32205, S32750,S32760

EN 10216
DIN 17456
DIN 17458

OD: 6.0-530.0mm
WT: 0.8-34.0mm

1.4301, 1.4307, 1.4541, 1.4401, 1.4404,
1.4571, 1.4878, 1.4432, 1.4462


3. Strategic Industrial Applications

Our seamless tubes are the preferred choice for critical fluid transportation and heat exchange in:

Energy & Power:Boilers, superheaters, heat exchangers, and renewable energy.

Oil & Gas:Offshore engineering, ship building, and petrochemical refineries.

Industrial Processing:Chemical, mining, water treatment, and paper industries.

Precision Engineering:Aviation, pharmaceutical, and high-purity sanitary systems.

Infrastructure:Construction, HVAC systems, and marine engineering.


4. Export-Ready Packaging & Logistics

We ensure zero-damage delivery to international markets (Middle East, Southeast Asia, Africa, and beyond).

Protection:Plastic caps plugged on both ends; anti-rust oil or protective coating applied。

Wrapping:Waterproof paper or woven bags wrapped for maritime protection.

Bundling:Secure hexagonal bundles for safe crane handling and container loading.

Chemical Composition of ASTM A312 Stainless Steel Pipe Grades

Grade UNS No. C Mn P S Si Cr Ni Mo Other
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 8.0-12.0 - -
TP316 S31600 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 -
TP321 S32100 0.08 2 0.045 0.03 1 17.0-19.0 9.0-12.0 - Ti: 5x(C+N)-0.70
TP347 S34700 0.08 2 0.045 0.03 1 17.0-19.0 9.0-13.0 - Cb+Ta: 10xC-1.10
TP310S S31008 0.08 2 0.045 0.03 1 24.0-26.0 19.0-22.0 - -

ASTM A312 Pipe Sizes and Dimensions

NPS Designator Outside Diameter Nominal Wall Thickness
in. mm Schedule 5SA (in.) Schedule 5SA (mm) Schedule 10SA (in.) Schedule 10SA (mm) Schedule 40S (in.) Schedule 40S (mm) Schedule 80S (in.) Schedule 80S (mm)
1/8 0.405 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 0.675 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 1.05 26.67 0.065 1.65 0.083 2.11 0.113 2.87 0.154 3.91
1 1.315 33.4 0.065 1.65 0.109 2.77 0.133 3.38 0.179 4.55
1 1/2 1.66 42.16 0.065 1.65 0.109 2.77 0.14 3.56 0.191 4.85
1 1/4 1.9 48.26 0.065 1.65 0.109 2.77 0.145 3.68 0.2 5.08
2 2.375 60.33 0.065 1.65 0.109 2.77 0.154 3.91 0.218 5.54
2 1/2 2.875 73.03 0.083 2.11 0.12 3.05 0.203 5.16 0.276 7.01
3 3.5 88.9 0.083 2.11 0.12 3.05 0.216 5.49 0.3 7.62
3 1/2 4 101.6 0.083 2.11 0.12 3.05 0.226 5.74 0.318 8.08
4 4.5 114.3 0.083 2.11 0.12 3.05 0.237 6.02 0.337 8.56
5 5.563 141.3 0.109 2.77 0.134 3.4 0.258 6.55 0.375 9.52
6 6.625 168.28 0.109 2.77 0.134 3.4 0.28 7.11 0.432 10.97
8 8.625 219.08 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 14 355.6 0.156 3.96 0.188 4.78 ... ... ... ...
16 16 406.4 0.165 4.19 0.188 4.78 ... ... ... ...
18 18 457.2 0.165 4.19 0.188 4.78 ... ... ... ...
20 20 508 0.188 4.78 0.218 5.54 ... ... ... ...
22 22 558.8 0.188 4.78 0.218 5.54 ... ... ... ...
24 24 609.6 0.218 5.54 0.25 6.35 ... ... ... ...
30 30 762 0.25 6.35 0.312 7.92 ... ... ... ...

ASTM A312 Steel Pipe Size Tolerance Table:

Standard Out diameter (mm) Wall thickness (mm) Length (mm)
ASTM A312 ≤48.26 +0.4 +(Unspecified)-12.50% Definite cut length+6.40-0
-0.8
>48.26~114.30 +0.8
-0.8
>114.30~219.08 +1.6
-0.8
>219.08~457.20 +2.4/-0.8
>457~660 +3.2
-0.8
>660~864 +4
-0.8
>864~1219 +4.48
-0.8

Weight And Thickness Of S.S Gauge Pipes

Size (inch) OD (mm) 10 SWG (3.2mm) 12 SWG (2.6mm) 14 SWG (2.1mm) 16 SWG (1.65mm) 18 SWG (1.2mm)
Unit - Weight/Mtr Weight/Mtr Weight/Mtr Weight/Mtr Weight/Mtr
1/2" 12.7 0.754 0.651 0.552 0.452 0.342
3/4" 19.05 1.258 1.061 0.883 0.712 0.531
1" 25.4 1.762 1.47 1.214 0.972 0.72
1 1/2" 38.1 2.77 2.289 1.875 1.492 1.098
2" 50.8 3.778 3.108 2.537 2.012 1.476
3" 76.2 5.794 4.747 3.86 3.051 2.232
4" 101.6 7.81 6.385 5.183 4.091 2.988

Seamless Stainless Steel Pipe Production Process

Frequently Asked Questions


1. Which stainless steel grades and standards do you supply?

We provide a wide range of Seamless Stainless Steel Pipes in accordance with ASTM A312 and EN 10216-5 standards, specializing in popular grades such as 304/304L and 316/316L to meet various industrial requirements.

2. How do you ensure the corrosion resistance of your stainless pipes?

Every pipe undergoes strict Internal Quality Control, including chemical composition analysis and intergranular corrosion testing, to ensure the material performs reliably in high-acid or saline environments.

3. Can you provide official documentation for material traceability?

Yes, all shipments are delivered with a Mill Test Certificate (MTC) according to EN 10204 3.1, detailing the precise mechanical properties and chemical heat analysis of the steel.

4. How do you prevent surface contamination and damage during shipping?

We use sea-worthy packaging, including individual plastic wrapping or wooden crates and plastic pipe-end protectors, to ensure the stainless steel surfaces remain free from scratches and contamination during transit.


Chemical Composition of ASTM A312 Stainless Steel Pipe Grades

Grade UNS No. C Mn P S Si Cr Ni Mo Other
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 8.0-12.0 - -
TP316 S31600 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 -
TP321 S32100 0.08 2 0.045 0.03 1 17.0-19.0 9.0-12.0 - Ti: 5x(C+N)-0.70
TP347 S34700 0.08 2 0.045 0.03 1 17.0-19.0 9.0-13.0 - Cb+Ta: 10xC-1.10
TP310S S31008 0.08 2 0.045 0.03 1 24.0-26.0 19.0-22.0 - -

ASTM A312 Pipe Sizes and Dimensions

NPS Designator Outside Diameter Nominal Wall Thickness
in. mm Schedule 5SA (in.) Schedule 5SA (mm) Schedule 10SA (in.) Schedule 10SA (mm) Schedule 40S (in.) Schedule 40S (mm) Schedule 80S (in.) Schedule 80S (mm)
1/8 0.405 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 0.675 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 1.05 26.67 0.065 1.65 0.083 2.11 0.113 2.87 0.154 3.91
1 1.315 33.4 0.065 1.65 0.109 2.77 0.133 3.38 0.179 4.55
1 1/2 1.66 42.16 0.065 1.65 0.109 2.77 0.14 3.56 0.191 4.85
1 1/4 1.9 48.26 0.065 1.65 0.109 2.77 0.145 3.68 0.2 5.08
2 2.375 60.33 0.065 1.65 0.109 2.77 0.154 3.91 0.218 5.54
2 1/2 2.875 73.03 0.083 2.11 0.12 3.05 0.203 5.16 0.276 7.01
3 3.5 88.9 0.083 2.11 0.12 3.05 0.216 5.49 0.3 7.62
3 1/2 4 101.6 0.083 2.11 0.12 3.05 0.226 5.74 0.318 8.08
4 4.5 114.3 0.083 2.11 0.12 3.05 0.237 6.02 0.337 8.56
5 5.563 141.3 0.109 2.77 0.134 3.4 0.258 6.55 0.375 9.52
6 6.625 168.28 0.109 2.77 0.134 3.4 0.28 7.11 0.432 10.97
8 8.625 219.08 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 14 355.6 0.156 3.96 0.188 4.78 ... ... ... ...
16 16 406.4 0.165 4.19 0.188 4.78 ... ... ... ...
18 18 457.2 0.165 4.19 0.188 4.78 ... ... ... ...
20 20 508 0.188 4.78 0.218 5.54 ... ... ... ...
22 22 558.8 0.188 4.78 0.218 5.54 ... ... ... ...
24 24 609.6 0.218 5.54 0.25 6.35 ... ... ... ...
30 30 762 0.25 6.35 0.312 7.92 ... ... ... ...

ASTM A312 Steel Pipe Size Tolerance Table:

Standard Out diameter (mm) Wall thickness (mm) Length (mm)
ASTM A312 ≤48.26 +0.4 +(Unspecified)-12.50% Definite cut length+6.40-0
-0.8
>48.26~114.30 +0.8
-0.8
>114.30~219.08 +1.6
-0.8
>219.08~457.20 +2.4/-0.8
>457~660 +3.2
-0.8
>660~864 +4
-0.8
>864~1219 +4.48
-0.8

Weight And Thickness Of S.S Gauge Pipes

Size (inch) OD (mm) 10 SWG (3.2mm) 12 SWG (2.6mm) 14 SWG (2.1mm) 16 SWG (1.65mm) 18 SWG (1.2mm)
Unit - Weight/Mtr Weight/Mtr Weight/Mtr Weight/Mtr Weight/Mtr
1/2" 12.7 0.754 0.651 0.552 0.452 0.342
3/4" 19.05 1.258 1.061 0.883 0.712 0.531
1" 25.4 1.762 1.47 1.214 0.972 0.72
1 1/2" 38.1 2.77 2.289 1.875 1.492 1.098
2" 50.8 3.778 3.108 2.537 2.012 1.476
3" 76.2 5.794 4.747 3.86 3.051 2.232
4" 101.6 7.81 6.385 5.183 4.091 2.988

Seamless Stainless Steel Pipe Production Process

Frequently Asked Questions


1. Which stainless steel grades and standards do you supply?

We provide a wide range of Seamless Stainless Steel Pipes in accordance with ASTM A312 and EN 10216-5 standards, specializing in popular grades such as 304/304L and 316/316L to meet various industrial requirements.

2. How do you ensure the corrosion resistance of your stainless pipes?

Every pipe undergoes strict Internal Quality Control, including chemical composition analysis and intergranular corrosion testing, to ensure the material performs reliably in high-acid or saline environments.

3. Can you provide official documentation for material traceability?

Yes, all shipments are delivered with a Mill Test Certificate (MTC) according to EN 10204 3.1, detailing the precise mechanical properties and chemical heat analysis of the steel.

4. How do you prevent surface contamination and damage during shipping?

We use sea-worthy packaging, including individual plastic wrapping or wooden crates and plastic pipe-end protectors, to ensure the stainless steel surfaces remain free from scratches and contamination during transit.


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