ASTM A790 Duplex Seamless Steel Pipe with High Strength
ASTM A790 Duplex Seamless Steel Pipe with High Strength
Description
ASTM A790 is the premier standard specification for seamless and welded ferritic/austenitic (duplex) stainless steel pipes. Engineered for environments demanding both high mechanical strength and exceptional corrosion resistance, this specification covers premium grades such as Duplex S32205 (2205) and Super Duplex S32750 (2507).
Unlike traditional austenitic grades, ASTM A790 duplex stainless steel pipes offer superior defense against chloride stress corrosion cracking (SCC), pitting, and crevice corrosion. With nearly double the yield strength of standard 316L, these pipes allow for reduced wall thickness, significantly lowering overall project material costs. They are the ideal piping solution for critical applications in the oil and gas, chemical processing, marine engineering, and desalination industries. Choosing ASTM A790 seamless pipes ensures maximum durability, reliable performance, and an extended service life in the most aggressive global environments.
| Item | Description | |
|---|---|---|
| Basic Information | Material Grade | S31803 , S32205 ( 2205 ) , S32750 ( 2507 ) , S32760 |
| Outer Diameter | NPS 1/8" - 30" & DN6 - DN750 | |
| Wall Thickness | SCH 5S , SCH 10S, SCH 40S , SCH 80S , SCH 10, SCH 20, SCH 30, SCH 40, SCH 80, STD, SCH 60, SCH XS, SCH 100, SCH 120, SCH 140, SCH 160, SCH XXS, According to ASME B36.10 and ASME B36.19 | |
| Length | Random length or Fixed length (6m) or other fixed length according to your request. | |
| Standard | ASTM A790/A790M , ASME SA790/790M , ASTM A789/789M , ASME SA789/789M | |
| Process Method | Cold Drawn or Cold Rolled | |
| End Type | PE or BE | |
| Delivery condition | Annealed & Pickled / Solid Solution & Pickling / Microstructure Examination | |
| Industry & Advantage | Application | a) Oil & Gas Transportation |
| b) Marine & Shipbuilding | ||
| c) Petrochemical & Chemical Process | ||
| d) Pulp and Paper Industry | ||
| e) Desalination Plants | ||
| f) Boiler & Heat exchanger | ||
| g) Food and Beverage | ||
| Advantages | a) Professional production ( Good Quality ) | |
| b) Fast lead time | ||
| c) Sufficient stock in warehouse | ||
| d) Perfect inspection method and inspection equipment | ||
| Terms & Conditions | Price Item | FOB , CFR , CIF , EXW , FCA or as negotiation |
| Payment | T/T, LC at sight or as negotiation | |
| Delivery Time | 20 - 40 working days after we receive your advanced payment ( Normally according to the actual order quantity ) | |
| Package | Iron case , Plywood box , Plywood frame , Knitted bag or as per customer's actual requirement. | |
| Quality Requirement | Mill Test Certificate will be supplied with shipment , Third Party Inspection is acceptable | |
| Quality | Test | NDT ( Ultrasonic test , Eddy Current test , Hydrostatic test ) |
| Mechanical Test ( Tensile Test , Flaring Test , Flattening Test , Hardness Test , Intergranular Corrosion Test ) | ||
| Metal Test ( Metallographic Analysis , Austenitic / Ferritic & Duplex Stainless Steel ) | ||
| Chemical Analysis ( Spectrometer ) , PMI ( Portable chemical analyzer ) | ||
| Market | Main Market | Europe , Middle East , Southeast Asia , South America etc |
| UNS Designation | Type | C (carbon) | Mn | P | S | Si | Ni | Cr | Mo | N | Cu | Others |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S31200 | ≤0.030 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 5.5-6.5 | 24.0-26.0 | 1.20-2.00 | 0.14-0.20 | ... | … | |
| S31260 | ≤0.030 | ≤1.00 | ≤0.030 | ≤0.030 | ≤0.75 | 5.5-7.5 | 24.0-26.0 | 2.5-3.5 | 0.10-0.30 | 0.20-0.80 | W 0.10-0.50 | |
| S31500 | ≤0.030 | 1.20-2.00 | ≤0.030 | ≤0.030 | 1.40-2.00 | 4.2-5.2 | 18.0-19.0 | 2.50-3.00 | 0.05-0.10 | ... | ... | |
| S31803 | ≤0.030 | ≤2.00 | ≤0.030 | ≤0.020 | ≤1.00 | 4.5-6.5 | 21.0-23.0 | 2.5-3.5 | 0.08-0.20 | ... | ... | |
| S32003 | ≤0.030 | ≤2.00 | ≤0.030 | ≤0.020 | ≤1.00 | 3.0-4.0 | 19.5-22.5 | 1.50-2.00 | 0.14-0.20 | ... | ... | |
| S32101 | ≤0.040 | 4.0-6.0 | ≤0.040 | ≤0.030 | ≤1.00 | 1.35-1.70 | 21.0-22.0 | 0.10-0.80 | 0.20-0.25 | 0.10-0.80 | ... | |
| S32202 | ≤0.030 | ≤2.00 | ≤0.040 | ≤0.010 | ≤1.00 | 1.00-2.80 | 21.5-24.0 | ≤0.45 | 0.18-0.26 | ... | ... | |
| S32205 | 2205 | ≤0.030 | ≤2.00 | ≤0.030 | ≤0.020 | ≤1.00 | 4.5-6.5 | 22.0-23.0 | 3.0-3.5 | 0.14-0.20 | ... | ... |
| S32304 | 2304 | ≤0.030 | ≤2.50 | ≤0.040 | ≤0.040 | ≤1.00 | 3.0-5.5 | 21.5-24.5 | 0.05-0.60 | 0.05-0.20 | 0.05-0.60 | ... |
| S32506 | ≤0.030 | ≤1.00 | ≤0.040 | ≤0.015 | ≤0.90 | 5.5-7.2 | 24.0-26.0 | 3.0-3.5 | 0.08-0.20 | ... | W 0.05-0.30 | |
| S32520 | ≤0.030 | ≤1.5 | ≤0.035 | ≤0.020 | ≤0.80 | 5.5-8.0 | 24.0-26.0 | 3.0-5.0 | 0.20-0.35 | 0.5-3.00 | ... | |
| S32550 | 255 | ≤0.04 | ≤1.50 | ≤0.040 | ≤0.030 | ≤1.00 | 4.5-6.5 | 24.0-27.0 | 2.9-3.9 | 0.10-0.25 | 1.50-2.50 | ... |
| S32707 | ≤0.030 | ≤1.50 | ≤0.035 | ≤0.010 | ≤0.50 | 5.5-9.5 | 26.0-29.0 | 4.0-5.0 | 0.30-0.50 | ≤1.0 | Co 0.5-2.0 | |
| S32750 | 2507 | ≤0.030 | ≤1.20 | ≤0.035 | ≤0.020 | ≤0.80 | 6.0-8.0 | 24.0-26.0 | 3.0-5.0 | 0.24-0.32 | ≤0.5 | ... |
| S32760 | ≤0.030 | ≤1.00 | ≤0.030 | ≤0.010 | ≤1.00 | 6.0-8.0 | 24.0-26.0 | 3.0-4.0 | 0.20-0.30 | 0.50-1.00 | W 0.50-1.00 | |
| S32808 | ≤0.030 | ≤1.10 | ≤0.030 | ≤0.010 | ≤0.50 | 7.0-8.2 | 27.0-27.9 | 0.80-1.20 | 0.30-0.40 | ... | W 2.10-2.50 | |
| S32900 | 329 | ≤0.08 | ≤1.00 | ≤0.040 | ≤0.030 | ≤0.75 | 2.5-5.0 | 23.0-28.0 | 1.00-2.00 | - | ... | ... |
| S32906 | ≤0.030 | 0.80-1.50 | ≤0.030 | ≤0.030 | ≤0.80 | 5.8-7.5 | 28.0-30.0 | 1.50-2.60 | 0.30-0.40 | ≤0.80 | ... | |
| S32950 | ≤0.030 | ≤2.00 | ≤0.035 | ≤0.010 | ≤0.60 | 3.5-5.2 | 26.0-29.0 | 1.00-2.50 | 0.15-0.35 | ... | ... | |
| S33207 | ≤0.030 | ≤1.50 | ≤0.035 | ≤0.010 | ≤0.80 | 6.0-9.0 | 29.0-33.0 | 3.0-5.0 | 0.40-0.60 | ≤1.0 | ... | |
| S39274 | ≤0.030 | ≤1.00 | ≤0.030 | ≤0.020 | ≤0.80 | 6.0-8.0 | 24.0-26.0 | 2.5-3.5 | 0.24-0.32 | 0.20-0.80 | W 1.50-2.50 | |
| S39277 | ≤0.025 | ≤0.80 | ≤0.025 | ≤0.002 | ≤0.80 | 6.5-8.0 | 24.0-26.0 | 3.0-4.0 | 0.23-0.33 | 1.20-2.00 | W 0.8-1.2 | |
| S81921 | ≤0.030 | 2.00-4.00 | ≤0.040 | ≤0.030 | ≤1.00 | 2.00-4.00 | 19.0-22.0 | 1.00-2.00 | 0.14-0.20 | ... | ... | |
| S82011 | ≤0.030 | 2.0-3.0 | ≤0.040 | ≤0.020 | ≤1.00 | 1.00-2.00 | 20.5-23.5 | 0.10-1.00 | 0.15-0.27 | ≤0.50 | ... | |
| S82121 | ≤0.035 | 1.00-2.50 | ≤0.040 | ≤0.010 | ≤1.00 | 2.00-4.00 | 21.0-23.0 | 0.30-1.30 | 0.15-0.25 | 0.20-1.20 | ... | |
| S82441 | ≤0.030 | 2.5-4.0 | ≤0.035 | ≤0.005 | ≤0.70 | 3.0-4.5 | 23.0-25.0 | 1.00-2.00 | 0.20-0.30 | 0.10-0.80 | ... | |
| S83071 | ≤0.030 | 0.50-1.50 | ≤0.030 | ≤0.020 | ≤0.50 | 6.0-8.0 | 29.0-31.0 | 3.0-4.0 | 0.28-0.40 | ≤0.80 | ... |
| PREN Data | ||
|---|---|---|
| Steel Grade | Equation | Requirement |
| Duplex S31803 | PREN=%Cr+3.3x%Mo+16x%N | ≥35 |
| Duplex S32205 | PREN=%Cr+3.3x%Mo+16x%N | ≥35 |
| Super Duplex S32750 | PREN=%Cr+3.3x%Mo+16x%N | ≥41 |
| Super Duplex S32760 | PREN=%Cr+3.3x(%Mo+0.5x%W)+16x%N | ≥41 |
| Outside Diameter Tolerance | |
|---|---|
| Outside Diameter (NPS) | Tolerance (mm) |
| 1/8" ≤ OD ≤ 1 1/2" | +0.4, -0.8 |
| 1 1/2" < OD ≤ 4" | +0.8, -0.8 |
| 4" < OD ≤ 8" | +1.6, -0.8 |
| 8" < OD ≤ 18" | +2.4, -0.8 |
| 18" < OD ≤ 26" | +3.2, -0.8 |
| 26" < OD ≤ 34" | +4.0, -0.8 |
| 34" < OD ≤ 48" | +4.8, -0.8 |
| Wall Thickness Tolerance | % |
|---|---|
| Nominal Wall Thickness | -12.5%≤ |
| Minimum Wall Thickness | 0%≤ |
| Mechanical Properties and Hardness Requirement | |||||
|---|---|---|---|---|---|
| UNS Designation | Tensile Strength Mpa, min | Yield Strength Mpa, min | Elongation min%, 2in or 50mm | HBW, max | HRC, max |
| S31803 | 620 | 450 | 25 | 290 | 30 |
| S32205 | 655 | 450 | 25 | 290 | 30 |
| S32750 | 800 | 550 | 15 | 300 | 32 |
| S32760 | 750 | 550 | 25 | 310 | 32 |
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Secure Packaging & Global Delivery
We understand that protecting high-value duplex stainless steel during transit is critical. All our ASTM A790 seamless pipes are meticulously packed to ensure they arrive at your site in mill-condition:
End Protection: Plastic caps fitted on both ends to protect bevels and prevent internal contamination.
Bundle Packing: Hexagonal steel-strapped bundles with protective material for standard sizes.
Seaworthy Wooden Cases: Fumigation-free plywood boxes or wooden crates for thin-wall pipes (e.g., Sch 10S) or LCL (Less than Container Load) shipments to prevent mechanical damage.
Surface Protection: Wrapped with waterproof plastic film and woven bags to prevent moisture and chloride exposure during ocean freight.
Why Partner With Us?
1. Professional Manufacturer
With decades of expertise in seamless stainless steel pipes, our advanced mill ensures precision engineering and top-tier industrial performance.
2. Full Certification
Our factory certified by Domestic and International institutions holding certificates such as TS ISO9001, AD2000, PED, CCS, DNV, ABS, Etc.
3. Large Stock & Fast Delivery
We maintain a massive inventory of raw materials and finished pipes. Our flexible production lines guarantee the shortest lead times in the industry.
4. Rigorous Quality Control
Zero defects is our goal. Professional inspectors, Every pipe undergoes strict Hydrostatic, Eddy Current, and PMI testing before leaving our company.
5. Secure Packaging & Shipping
From plastic end caps to seaworthy wooden cases, our professional packaging prevents any transit damage, ensuring your cargo arrives in perfect condition.
6. Reliable After-Sales Support
We stand behind our products. If any quality issues arise, our team provides a 24-hour rapid response and immediate technical solutions to protect your interests.
Frequently Asked Questions (ASTM A790) FAQ
Q1: What is the difference between Duplex S32205 and S31803?
A: While both are considered 2205 duplex stainless steel, S32205 is a modified, higher-end version of S31803. S32205 specifies higher minimum limits for Chromium, Molybdenum, and Nitrogen. This guarantees a higher PREN (Pitting Resistance Equivalent Number), ensuring superior resistance to pitting and crevice corrosion compared to standard S31803.
Q2: Why choose ASTM A790 duplex pipes over ASTM A312 austenitic pipes?
A: ASTM A790 duplex pipes (like 2205) offer nearly twice the yield strength of standard A312 austenitic grades (like 316L). Furthermore, duplex pipes provide exceptional resistance to Chloride Stress Corrosion Cracking (SCC), a common failure point for 300-series stainless steel in marine and high-temperature chemical environments.
Q3: Can you manufacture heavy-wall duplex pipes like Schedule 160?
A: Absolutely. Our advanced cold-drawing and cold-rolling facilities allow us to produce seamless duplex pipes across all standard schedules, from thin-wall Sch 10S up to heavy-wall Sch 160 and XXS, strictly adhering to ASTM A999 dimensional tolerances.
Q4: Do you provide Mill Test Certificates (MTC) for your A790 pipes?
A: Yes. Every batch of our seamless pipes is supplied with a fully traceable EN 10204 3.1 MTC, detailing chemical composition, mechanical properties, and NDT (Non-Destructive Testing) results. We also welcome Third-Party Inspections (TPI) from internationally recognized agencies such as SGS, TUV, or DNV.
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