RA refers to the American company, 253MA is the brand name

253MA is nickel-saving heat-resistant austenitic stainless steel

Overview of 253MA:?

253MA is a heat-resistant stainless steel type developed based on 21Cr-l1Ni stainless steel and alloyed with rare earth elements cerium (ce) and cyanide (N). Under normal conditions, 253MA has a fully austenitic structure. Due to the synergistic effect of rare earth elements and silicon, the material still has good oxidation resistance at 1150°C. The presence of cyanide, carbon and evenly distributed rare earth elements and alkali metal oxides gives 253MA a durable strength comparable to nickel-based alloys. Therefore, 253MA can replace expensive nickel-based alloys and can be widely used in non-pressure high-temperature components with operating temperatures above 900°C, as well as in pressure-bearing applications below 900°C.

Corresponding grades of 253MA:

DIN/EN 1.4835, ASTM S30815, UNS S30815, 253MA?

Shanghai Bossiman 253MA

253MA Characteristics:

253MA is a nickel-free, heat-resistant austenitic stainless steel designed for applications requiring high creep strength and good corrosion resistance. 253MA is an alloy obtained by increasing the nitrogen content and adding rare earth elements for micro-alloying on the basis of alloy 1.4828. It has good oxidation resistance, good high-temperature corrosion resistance, and good high-temperature mechanical strength. Its operating temperature range is 850~1100°C. If used in the range of 600 to 850°C, the impact toughness at room temperature will be reduced due to structural changes.

The chemical composition of 253MA is balanced, so that the steel has the most suitable comprehensive performance in the temperature range of 850℃-1100℃, extremely high oxidation resistance, and the oxide scale temperature is as high as 1150℃; extremely High creep deformation resistance and creep rupture strength; good resistance to high temperature corrosion and balance brush corrosion in most gas media; high yield strength and tensile strength at high temperatures; good durability Formability and weldability, as well as adequate machinability. .

1. Compared with 310S and 1Cr20Ni14Si2, it has superior performance, saves Ni and is cheap.

2. It has high strength at 900℃. In the air, it can be used up to 1150℃ under non-pressure conditions, and has excellent high temperature oxidation resistance.

3. The short-term tensile strength at each temperature is more than 20% higher than that of ordinary stainless steel (such as 304, 310S).

4. It has high temperature and long-term performance (creep performance, durability performance).

In addition to the alloying elements chromium and nickel, this grade of stainless steel also contains a small amount of rare earth metals (REM), which significantly improves its oxidation resistance. Nitrogen is added to improve creep properties and make the steel fully austenitic. Despite its relatively low chromium and nickel content, this stainless steel has in many cases the same high-temperature properties as highly alloyed alloy steels and nickel-based alloys.

253MA process information:

Heat treatment

The solid solution treatment specifications of 253MA are: temperature 1050~1150℃, holding for 5~20 minutes, air cooling or water quenching. The commonly used solid solution temperature for thick plates is 1070~1100℃.

Forming

Steel plate forming should be carried out at room temperature as much as possible. If hot bending is required, the entire cross-section of the workpiece should be evenly heated to 1100°C, and the final forming temperature should be above 900°C.

Welding

253MA is suitable for all common welding methods. No need for preheating before welding and post-weld heat treatment. Interlaminar temperatures should be kept low to prevent thermal cracking.

Scope of use of 253MA:

253MA is widely used in sintering equipment, blast furnace equipment, steel melting, furnaces and continuous casting equipment, rolling mills (heating furnaces), heat treatment furnaces and accessories, minerals Equipment and cement production equipment, etc. 253MA steel can be used in pressure-bearing situations up to 900°C and non-pressure-bearing high-temperature parts with working temperatures up to 1150°C.

253MA main specifications:

253MA seamless pipe, 253MA steel plate, 253MA round steel, 253MA forgings, 253MA flange, 253MA ring, 253MA welded pipe, 253MA steel strip, 253MA straight bar, 253MA wire and accessories Welding materials, 253MA round cakes, 253MA flat steel, 253MA hexagonal rods, 253MA big and small heads, 253MA elbows, 253MA tees, 253MA processed parts, 253MA bolts and nuts, 253MA fasteners