What typical applications is 1.4562 used in?

1.4562 stainless steel, commonly known as Alloy 31 or UNS N08031, is a high-performance, nitrogen-enhanced austenitic stainless steel that bridges the gap between super austenitic stainless steels and nickel-based alloys. With its high chromium, molybdenum, and nitrogen content, combined with significant nickel and copper, it offers exceptional resistance to both oxidizing and reducing acids, as well as outstanding resistance to chloride-induced pitting and crevice corrosion. This makes it suitable for the most demanding chemical processing, pollution control, and offshore applications.

Equivalent Grades of 1.4562 stainless steel

Available forms: seamless & welded tubes, plates, sheets, round bars, forgings, flanges, fittings.

Chemical Composition of 1.4562 stainless steel

Ultra‑low carbon minimizes intergranular corrosion risk after welding. High molybdenum‑nitrogen delivers excellent pitting / crevice corrosion resistance; copper improves performance in reducing acids such as sulfuric & phosphoric acid. PREN＞50.

Mechanical Properties of 1.4562 stainless steel

Not hardenable by heat treatment; strength can only be increased by cold working. Solution annealing range: 1100‑1150 ℃ followed by rapid cooling.

Physical Properties (20 ℃) of 1.4562 stainless steel

1.Chemical Processing:

Reactors, heat exchangers, and piping for aggressive acid services, particularly sulfuric and phosphoric acid production.

2.Pollution Control:

Scrubbers, ducting, and chimney liners in flue gas desulfurization (FGD) systems.

3.Offshore & Marine:

Seawater piping, pumps, and valves in desalination plants and offshore platforms.

4.Pharmaceutical:

Equipment handling corrosive cleaning agents and process chemicals.

5.Pulp & Paper:

Bleaching equipment and digesters in aggressive environments.

Seawater desalination piping

chemical process piping

 high‑pressure piping for offshore platforms

Note: Not suitable for concentrated hot hydrochloric acid service.

GNEE is a professional manufacturer and exporter of 1.4562 super‑austenitic stainless steel. We keep full‑specification plates, pipes, bars and custom forgings in stock. Featuring stable quality, complete certificates and flexible lead‑time, our products deliver outstanding resistance to mixed‑acid corrosion and pitting corrosion. They are widely used in high‑end anti‑corrosion projects such as flue‑gas desulfurization, wet‑process phosphoric acid and marine chemical engineering. We export worldwide and support bulk orders, trial orders and custom deep‑processing services.

1.4562 stainless steel tubes

1.4562 stainless steel bars

1.4562 stainless steel plates

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How does Alloy 31 (1.4562) compare to 904L (1.4539) and 6% Mo grades?
Alloy 31 offers significantly higher performance than 904L and even surpasses most 6% molybdenum super austenitic grades. Compared to 904L, Alloy 31 contains higher chromium (27% vs. 21%), higher nickel (31% vs. 25%), higher molybdenum (6.5% vs. 4.5%), and nitrogen addition, giving it a much higher PREN (>45 vs. 32-34). This translates to superior resistance to pitting, crevice corrosion, and reducing acids. Compared to 6% Mo grades like 254 SMO, Alloy 31 offers better performance in highly reducing environments and higher temperature capability. It bridges the gap between super austenitic stainless steels and nickel-based alloys like C-276, often serving as a cost-effective alternative where the full capabilities of nickel alloys are not required.

What are the welding considerations for Alloy 31 (1.4562) stainless steel?
Welding Alloy 31 requires careful control to maintain corrosion resistance. Recommended practices include using matching or over-alloyed filler metals, such as Alloy 59 or Alloy 625 type fillers, to ensure the weld zone maintains corrosion resistance comparable to the base metal. Controlled heat input (typically 0.5-1.5 kJ/mm) and proper shielding gas (argon-based) are important to avoid excessive grain growth and precipitation of detrimental phases. Interpass temperature should be kept below 100°C. Post-weld cleaning is recommended to restore corrosion resistance, and pickling/passivation should be performed to ensure optimum performance.

What temperature range is Alloy 31 suitable for?
Alloy 31 is suitable for a wide temperature range, from cryogenic conditions up to about 400°C (752°F) for continuous service. Its high nickel content ensures excellent toughness at low temperatures, while its stable austenitic structure maintains good mechanical properties at elevated temperatures. For corrosion resistance, it performs exceptionally well up to about 250°C in many acid environments. Above 400°C, long-term exposure may lead to microstructural changes that could affect properties, so higher temperatures should be evaluated based on specific application requirements.