General Corrosion

China united iron and steel limited exported stainless steel grade: ASTM/ASME Grade 304, Grade 304L,304h, 316, 316L, 316H, 316TI, 321, 321H, 309S, 309H, 310S, 310H, 410S, 2205, 904L, 2507, 254, gh3030, 625, 253MA, S30815, 317L, Type 317, 316lN, 8020, 800, 800H, C276, S32304 and others special requirement stainless steel grade.

What is the highest grade of stainless steel?

Type 304: The best known grade is Type 304, also known as 18/8 and 18/10 for its composition of 18% chromium and 8%/10% nickel, respectively. Type 316: The second most common austenitic stainless steel is Type 316.

Intergranular Corrosion

Ferralium® 255 – SD50 (super duplex 255) is a chrome steel which is supplied in the scorching worked and annealed situation. It achieves greater strengths than most other stainless steels and various corrosion resistant alloys, offering the potential to reduce section size and therefore weight and value. Alloy 254, is a excessive alloy austenitic stainless-steel supplied within the scorching labored and annealed condition. Significant additions of Mo, Ni and Cu offers this alloy a great resistance to pitting and crevice corrosion, especially in environments containing halide ions e.g. chloride, bromide and fluoride options.

This provides Sandvik SAF 2507® particular design advantages over austenitic stainless steels in tools comprising of both carbon steel and stainless-steel. Propeller shafts and other products subjected to high mechanical load in seawater and different chloride-containing environmentsDesulfurization unitsAs reheater tubes in flue fuel desulfurization systems. The good mechanical and corrosion properties make Sandvik SAF 2507® a cost-effective alternative in lots of functions by reducing the life cycle value of apparatus.

  • Susceptibility to HISC significantly will increase with increasing austenite spacing.
  • Cold pilgered and answer annealed tubes with austenite spacing between 5-15 μm have shown very good resistance to HISC underneath applied stress up to a hundred thirty% of the yield strength without cracking.
  • A testing program carried out at Sandvik Materials Technology has confirmed that tendency to HISC is lowered when austenite spacing is less than 30 μm, as beneficial by DNV RP-F112.

If Sandvik SAF 2507® is uncovered to temperatures exceeding 250°C (480°F), for extended intervals, the microstructure adjustments, which results in a reduction in impact power. This doesn’t necessarily have an effect on the habits of the material at the operating temperature.

ISO S N L / AWS A5.9 ER2594 (e.g. Exaton 25.10.4.L) wire or strip electrodes are really helpful for overlay welding of tube sheets and high-pressure vessels in circumstances the place corrosion resistance, equal to that of Sandvik SAF 2507®, is required. The impression power of welded Sandvik SAF 2507® is also good, though the values are lower than the bottom steel. The influence energy, if gasoline shielded arc weldments, is a minimal of 27 J (20 ft lb) at a temperature of -50°C (-fifty eight°F).

Alloy 316L is an austenitic stainless-steel provided within the scorching labored and annealed situation. The addition of Mo offers the product with much Stainless steel manufacturer improved corrosion resistance compared with Alloy 304, particularly with respect to pitting and crevice corrosion in chloride environments.

saf 2507

What are the 5 types of stainless steel?

Super duplex stainless steel contains a mixture of austenitic and ferritic grains within its microstructure. Austenitic microstructures are non-magnetic, but ferritic microstructures are. Therefore super duplex grades are also considered magnetic.

The high fatigue energy of Sandvik SAF 2507® may be explained by its good mechanical properties, whereas its high resistance to corrosion fatigue has been proven by fatigue testing in corrosive media. Duplex stainless steels which have a high tensile energy often have a high fatigue restrict and high resistance to both fatigue and corrosion fatigue. is a FPSO in the Gulf of Guinea which confirmed severe indicators of corrosion in small diameter tubing in several places within the topside services, lower than a yr after the FPSO was moored in place offshore (Okeremi & Simon-Thomas, 2008). Ferralium® 255 is a brilliant duplex stainless-steel provided within the cold finished and annealed situation. It offers excellent corrosion resistance in a wide variety of corrosive chemical compounds together with sulphuric, nitric and phosphoric acid, seawater and other chloride containing environments.