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| Brand Name: | TORICH |
| Model Number: | ASTM A928 |
| MOQ: | 1 Ton |
| Price: | Negotiable |
| Payment Terms: | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability: | 60000 Ton/Tons per Year |
Duplex stainless steels are a family of stainless steels that have a mixed microstructure of austenite and ferrite. They are known for their high strength, excellent corrosion resistance, and good weldability. ASTM A928 is a standard specification for duplex stainless steel pipes, particularly for use in chemical transportation.
Duplex stainless steels are primarily composed of iron, chromium, and nickel, with varying amounts of molybdenum, nitrogen, and other alloying elements. The specific grades covered under ASTM A928 include:
ASTM A928 outlines the requirements for duplex stainless steel pipes used in various applications, particularly in environments that require resistance to pitting and crevice corrosion.
The following table presents the chemical composition of the various duplex stainless steel grades:
| Grade | C (%) | Cr (%) | Ni (%) | Mo (%) | N (%) | Fe (%) |
|---|---|---|---|---|---|---|
| 2205 | ≤0.03 | 22.0-23.0 | 4.5-6.5 | 3.0-5.0 | 0.08-0.2 | Balance |
| 2304 | ≤0.03 | 19.0-21.0 | 3.0-5.0 | 0.0-0.5 | 0.0-0.2 | Balance |
| 255 | ≤0.03 | 24.0-26.0 | 4.5-6.5 | 5.0-7.0 | 0.0-0.2 | Balance |
| 2507 | ≤0.03 | 24.0-26.0 | 6.0-8.0 | 3.5-5.0 | 0.0-0.2 | Balance |
| 329 | ≤0.03 | 24.0-26.0 | 4.0-6.0 | 0.0-0.5 | 0.0-0.2 | Balance |
The following table outlines the mechanical properties of the duplex stainless steel grades:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 2205 | ≥ 450 | ≥ 620 | ≥ 25 | ≤ 290 |
| 2304 | ≥ 450 | ≥ 600 | ≥ 30 | ≤ 290 |
| 255 | ≥ 500 | ≥ 700 | ≥ 20 | ≤ 300 |
| 2507 | ≥ 550 | ≥ 800 | ≥ 25 | ≤ 300 |
| 329 | ≥ 450 | ≥ 650 | ≥ 25 | ≤ 290 |
The steel grades mentioned above are specifically designed to meet the requirements of various applications in the chemical industry, oil and gas, and marine environments.
Duplex stainless steel pipes are widely used in:
While ASTM A928 grades are suitable for many applications, alternative grades may also be considered based on specific requirements:
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
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