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Pressure Tubes
Pressure Tubes
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Stainless Steel Tubes for High Pressure Service

Popular Standards

● GB/T13296                     GOST 9941                   A269/A269M
● A213/A213M                   JIS G3463                     EN10216-5
● A269/A269M                   A213/A213M                  EN10217-7
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Process Flowchart

Seamless SS Pipe
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Popular Industrial SS Grades

Grade

Type

C（max）

Cr

Ni

Mo

Others

T.S (MPa,max)

Y.S (MPa,min)

Elongation (%,min)

Hardness  (HBW)
304 Austenitic 0.08 18-20 8-10.5 -

Mn(2%)Si(0.75)

 515 205 40 201
304L Austenitic 0.03 18-20 8-12 - Low carbon 485 170 40 201
316 Austenitic 0.08 16-18 10-14 2-3 Improved C/R 515 205 40 217
316L Austenitic 0.03 16-18 10-14 2-3 Low carbon 485 170 40 217
321 Austenitic 0.08 17-19 9-12 - Ti (5x C min) 515 205 40 201
347 Austenitic 0.08 17-19 9-13 - Nb+Ta 515 205 40 201
410 Martensitic 0.15 11.5-13.5 - - Mn(1%)Si(1%) 485 275 20 217
420 Martensitic 0.15-0.40 12-14 - - High carbon 586 345 15 235
430 Ferritic 0.12 16-18 - - Mn(1%)Si(1%) 450 205 22 183
2205 Duplex 0.03 21-23 4.5-6.5 2.5-3.5 N(0.14-0.20%) 620 450 25 293
2507 Duplex 0.03 24-26 6-8 3-4 N(0.24-0.32%) 800 550 15 310
Notes:
1. Composition values are in weight % (balance Fe).  
2. Mechanical properties are typical values (may vary with heat treatment).  
3. Austenitic grades (304, 316) are non-magnetic, corrosion-resistant, and ductile.  
4. Martensitic grades (410, 420) are hardenable by heat treatment.  
5. Ferritic grades (430) are magnetic with moderate corrosion resistance.  
6. Duplex grades (2205, 2507) offer high strength and corrosion resistance. 

Cold Finished  (Cold-drawn or Cold-rolled) Seamless Tube Sizes Available

  • Table 01 Unit: MM
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Hot Finished Seamless Pipe Sizes Available

Table 02  Unit: MM
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Table 03 Unit: MM
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Options between stainless steel and carbon alloy steel materials for pressure tubing

Stainless steel tubing is often the preferred choice for high-pressure, high-temperature (HPHT) services in corrosive environments compared to carbon steel and low-alloy steels. Below are the key advantages:
5.1 Superior Corrosion Resistance
Stainless steel (especially grades like 304, 316, 321, 347, duplex 2205, and super austenitic 904L) contains chromium (Cr), nickel (Ni), and molybdenum (Mo), which form a passive oxide layer that resists oxidation, pitting, and crevice corrosion.
Carbon steel requires additional coatings or inhibitors in corrosive environments (e.g., acidic, chloride-rich, or H₂S-containing conditions), whereas stainless steel performs well without extra protection.
5.2. High-Temperature Strength & Oxidation Resistance
Stainless steels (particularly austenitic grades like 310, 321, 347) retain strength at elevated temperatures (up to 1000°C+ for some grades).
Carbon steel loses strength rapidly above 400-500°C and is prone to scaling and decarburization.
Stainless alloys with Ti/Nb (321/347) resist sensitization and carbide precipitation in high-temperature service.
5.3. Better Mechanical Properties Under HPHT Conditions
Higher yield strength and creep resistance compared to carbon steel, reducing deformation risks in high-pressure applications.
Duplex stainless steels (e.g., 2205) offer double the strength of 304/316 with excellent stress corrosion cracking (SCC) resistance.
5.4. Resistance to Sulfide Stress Cracking (SSC) & Hydrogen Embrittlement
In sour service (H₂S environments), stainless steels (especially super duplex or high-Ni alloys) outperform carbon steel, which is vulnerable to hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC).
5.5. Longer Service Life & Lower Maintenance
Stainless steel tubes last longer in aggressive environments, reducing downtime, replacements, and maintenance costs.
Carbon steel may require internal linings, corrosion allowances, or chemical inhibitors, increasing lifecycle costs.
5.6. Common Applications Where Stainless Outperforms Carbon Steel
Oil & Gas (HPHT wells, sour gas pipelines)
Chemical & Petrochemical (acidic/caustic processes)
Power Plants (superheaters, boilers)
Marine & Offshore (seawater corrosion resistance)
When Carbon Steel May Still Be Preferred
Non-corrosive, low-temperature applications (cost-saving where stainless is unnecessary).
Short-term projects where long-term corrosion resistance isn’t critical.

For HPHT + corrosive service, stainless steel tubing is often the best choice due to its corrosion resistance, high-temperature stability, and mechanical durability. While initial costs are higher than carbon steel, the extended service life and reduced failures justify the investment in harsh environments.
For more details on specific carbon and alloy steel tubing and pipes, please refer to the specific product details or contact us at your convenience.
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