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ASTM A312 Stainless Steel High Pressure Pipe Manufacturer

We at Zhejiang Xintongda Special Steel (XTD) specialise in manufacturing and supplying stainless steel high-pressure pipes in China. This pipe is designed for high and ultra-high pressure applications. We manufacture these SS pipes for high-pressure applications in accordance with ASTM A312, EN, JIS, and GB standards. This pipe has good strength, high corrosion resistance, and exceptional durability. At XTD, we provide these high-pressure pipes in grades like 304, 310, 316, and many more. We also provide customised solutions for outer diameter, thickness, and length. A typical stainless steel high pressure pipe can handle up to 19,000 psi of pressure. This is why it is useful in many critical situations. All our pipes are rigorously tested before we send them for delivery.

As a leading multiple international certified manufacturer and supplier with 4 decades of experience, we supply these pipes within a week for in-stock orders and in 15-60 days for production orders. We have a supply capacity of 25,000 tons a year.

Our thick-wall pipes in Schedule 80, Schedule 160, and XXS configurations provide the pressure containment required for critical fluid transfer applications. We offer competitive pricing with technical support for custom specifications.

  • Range Icon Size Range 6-1016 mm
  • Thickness Icon Thickness Range 1-65 mm
  • Length Icon Length ≤ 18 m
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stainless steel high pressure pipe

What is a High Pressure Stainless Steel Pipe?

A high-pressure stainless steel pipe is a heavy-duty tubular product made of stainless steel. It can handle extreme amounts of pressure and is highly resistant to corrosion against acids, alkalis, and chlorides. This pipe is particularly used in hydraulic systems, components of the power generation industry, and instrumentation lines. Since we make our high-pressure SS pipes without any welds, there is hardly any chance of weaker points in the pipes.

The pressure rating of stainless steel pipes depends on several factors: outside diameter, wall thickness (schedule number), operating temperature, and material grade. Industry classifications include:

  • Medium Pressure: Up to 20,000 PSI
  • High Pressure: 30,000 - 60,000 PSI
  • Ultra-High Pressure: 60,000 - 150,000+ PSI

Manufacturing Process of Stainless Steel High-Pressure Seamless Pipes

The stainless steel high-pressure seamless pipe is made by selecting a strong billet of stainless steel, and heating and piercing it to form a hollow shell. The next step is to pass this shell through hot-working and cold-drawing to get its precise dimensions. After that, we perform solution annealing to retain the pipe’s mechanical properties and corrosion resistance. The last step is pickling and straightening, and then it is sent for testing.

Key Properties of SS High Pressure Pipe

The SS high pressure pipe has 5 main characteristics:

  • High Pressure Resistance: There are a few factors that contribute to high pressure resistance. Chromium present in the alloy forms a passive layer when exposed to oxygen, which helps resist corrosion. Many grades of the SS high-pressure pipe have good tensile strength. The wall thickness of the pipe also impacts its performance under high pressure.
  • Thick wall design: This design of the pipe improves its ability to withstand high levels of internal pressure and harsh operating conditions.
  • Excellent Corrosion Resistance: The chemical composition (chromium, nickel, etc) creates a protective passive layer when the pipe is exposed to oxygen. This layer helps it to resist oxidation, pitting, crevice, and general corrosion.
  • Temperature Resistance: The temperature resistance is also a result of the pipe’s chemical composition, as elements like chromium, nickel, and molybdenum keep the alloy stable in various temperatures.
  • Ductility and Flexibility: This pipe gets its ductility mainly from its austenitic microstructure, present in grades like 304 and 316.

Technical Specifications of High-Pressure Stainless Steel Pipes

The technical specifications of high-pressure stainless steel pipes include the working pressure, sizes, and tolerances. Each grade has its own dimensions and tolerances.​

High Pressure Stainless Steel Pipe Working Pressures

The working pressure of a high-pressure stainless steel pipe varies from dimension to dimension and grade to grade. It ranges from 15,000 psi to 60,000 psi.

Nominal OD† OD Tolerance ID Pressure Rating*
1/4" +0.004" / -0.004" 3/32"
1/16" 		80,000 psi
114,000 psi
3/8" +0.004" / -0.004" 1/8"
1/16" 		90,000 psi
150,000 psi
9/16" +0.004" / -0.004" 5/16"
3/16" 		60,000 psi
90,000 psi
Nominal OD† OD Tolerance ID Range Pressure Rating*
1/4" -0.007" / +0.0" .104" / .109" 20,000 psi
3/8" -0.010" / +0.0" .198" / .203" 20,000 psi
9/16" -0.011" / +0.0" .307" / .312"
.354" / .359" 		20,000 psi
15,000 psi
3/4" -0.010" / +0.0" .432" / .437"
.510" / .515" 		20,000 psi
15,000 psi
1" -0.010" / +0.0" .557" / .562"
.682" / .687" 		20,000 psi
15,000 psi

Sizes of Stainless Steel High Pressure Pipe

This table shows the different sizes of high-pressure SS pipes and how they affect the pressure stability.

Outer Daimeter mm Outer Daimeter Inch Inner Daimeter mm Inner Daimeter Inch Wall Thickness mm Wall Thickness Inch Working pressure Working pressure Weight
6.35 1/4 2.39 3/32 1.98 0.0781 3,045 5,580 0.217
6 - 2.2 - 1.90 - 3,120 5,710 0.195
6.35 1/4 2.29 0.0902 2.03 0.0799 3,180 - 0.220
9.52 3/8 3.20 1/8 3.16 0.1245 3,380 6,190 0.503
6.35 1/4 1.59 1/16 2.38 0.0938 4,300 7,890 0.237
9.52 3/8 1.60 1/16 3.96 0.1560 5,530 10,140 0.551
14.00 - 5.00 - 4.50 - 3,200 - 1.070
14.00 - 8.00 - 3.00 - 2,330 - 0.826
14.30 9/16 8.00 5/16 3.15 0.1240 2,380 4,360 0.879
19.05 3/4 1.80 - 8.63 - - 12,00 2.251
14.30 9/16 4.76 3/16 4.77 0.1878 3,390 6,210 1.138
30.00 - 10 - 10 - - 6,250 5.008

Tolerances of SS High Pressure Pipe

Different grades have different dimensional tolerances, which affect the performance of the SS high-pressure pipe. The table below explains this in a better way.

SIZE Outer Daimeter - Nominal Wall Thickness - Outside Diameter Tolerance - Length Tolerance - Wall Thickness Tolerance
¾ 19.1 0.065 1.65 +/-0.005 +/-0.13 +⅛, -0 +3.18, -0 +/-10.0%
½ 12.7 0.065 1.65 +/-0.005 +/-0.13 +⅛, -0 +3.18, -0 +/-10.0%
1 25.4 0.065 1.65 +/-0.005 +/-0.13 +⅛, -0 +3.18, -0 +/-10.0%
2 50.8 0.065 1.65 +/-0.008 +/-0.20 +⅛, -0 +3.18, -0 +/-10.0%
1½ 38.1 0.065 1.65 +/-0.008 +/-0.20 +⅛, -0 +3.18, -0 +/-10.0%
2½ 63.5 0.065 1.65 +/-0.010 +/-0.25 +⅛, -0 +3.18, -0 +/-10.0%
4 101.6 0.083 2.11 +/-0.015 +/-0.38 +⅛, -0 +3.18, -0 +/-10.0%
3 76.2 0.065 1.65 +/-0.010 +/-0.25 +⅛, -0 +3.18, -0 +/-10.0%
6 152.4 0.109 2.77 +/-0.030 +/-0.76 +1, -0 +25.4, -0 +/-10.0%

Ultra High Pressure Stainless Steel Pipe Material Grades

We at Xintongda provide a wide range of stainless steel high-pressure pipes. Some of the grades are 304, 310, 316, 316L, etc.

GRADE UNS DIN / EN
304 S30400 1.4301
304L S30403 1.4306 / 1.4307
309S S30908 1.4833
310S S31008 1.4845
316 S31600 1.4401
316L S31603 1.4404
316Ti S31635 1.4571
316H S31609 1.4919
317 S31700 1.4449
317L S31703 1.4438
321 S32100 1.4541
321H S32109 1.4878
347 S34700 1.4550
904L N08904 1.4539

Stainless Steel High Pressure Pipe Industrial Applications

The SS high-pressure pipe finds its application in 6 main industries:

Oil & Gas

Chemical Processing

Power Generation

Aerospace

Automotive

Marine & Offshore Engineering

Oil & Gas

Oil & Gas

It is mainly used in downhole tubing, subsea pipelines, refineries, and gas processing plants.​
Chemical Processing

Chemical Processing

Used in storage tanks, pressure vessels, reactors, pumps, and for transporting corrosive and high-temperature substances.​
Power Generation

Power Generation

Applied in boilers, heat exchangers, ash systems, high-pressure fluid handling, and nuclear power plants.​
Aerospace

Aerospace

The high-pressure SS pipe is generally used in rocket engines and propellant tanks, instrumentation tubing, hydraulic systems, landing gear systems, and exhaust systems.​
Automotive

Automotive

This pipe is important for brake lines, fuel lines, and structural components.​
Marine & Offshore Engineering

Marine & Offshore Engineering

It is helpful in ballast systems, cryogenic liquid and gas transfer, coastal infrastructure, and submerged items.​

100% Certified Testing Documentation

  • Raw Materials Certificate
  • 100% Positive Material Identification (PMI)
  • Heat Treatment Charts
  • Third-Party Inspection Report
  • Surface roughness and size measurement
  • Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular Corrosion, Pitting Corrosion, Grain size, Eddy Current (ET), Ultrasonic Testing (UT), Hydrostatic Testing (HT), etc.)
  • Laboratory Test Certificate from Govt. Approved Lab
If you want to know more product details, please contact us!
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Frequently Asked Questions

  • What is the Difference Between Working Pressure and Burst Pressure?
    Working pressure is a normal operating pressure for a system, whereas burst pressure is the maximum amount of pressure the component can tolerate.
  • What pipe schedules are used for high pressure?
    We at XTD specialise in providing schedule 80 for the high pressure SS pipes. However, we can also provide other schedules like 160, XXS, and others if demanded.​
  • What standards apply to Stainless Steel High-Pressure Pipes?
    The ASTM A312 standard applies to our stainless steel high-pressure pipes.​​
  • Why is stainless steel preferred for high-pressure piping?
    Stainless steel is usually preferred for high-pressure piping mainly because of its good tensile strength, corrosion resistance, and high temperature stability.​​
  • What is the maximum pressure rating for stainless steel high pressure pipe?
    The maximum pressure rating for a standard stainless steel high pressure pipe is usually 19000-20000 psi. Cold-drawn thick-wall high-pressure tubing can withstand 30,000 to 60,000 psi, while specialised ultra-high-pressure tubing reaches up to 100,000 psi.
  • Which stainless steel grade is best for high pressure applications?
    SS 316L is commonly preferred for high-pressure service due to its excellent combination of corrosion resistance (particularly in chloride environments), good weldability from low carbon content, and adequate mechanical properties. For elevated temperature service above 425°C, 321 with titanium stabilization prevents sensitization. For extremely corrosive environments, duplex grades like 2205 offer higher strength with excellent corrosion resistance.
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