Stainless steel tube in the power station boiler industry application research and prospects

 

1.Super304H

Super304 is based on ASME SA213 TP304, by adding Cu, N, N b, B and other elements to improve the lasting strength, good process performance and design of a new steel grade. Ltd. and Mitsubishi Heavy Industries Group, is an essential material for the heating surface of high parameter supercritical boilers in service. The Japanese METI standard, named SUS304HJ1TB, was confirmed by ASME Code case 2328 in March 2000, and was included in ASTM A213M in 2001 with the grade S30432 and the DMV equivalent grade DMV304HCu.

 

Through the Sumitomo purchase of Super304H steel pipe by batch intergranular corrosion test, the statistical results show that: intergranular corrosion test pass rate is less than 50%. Appropriate increase in solid solution treatment temperature can improve the intergranular corrosion pass rate, but it will lead to large grain size, harming the resistance to steam oxidation performance. Intergranular corrosion can be avoided by strengthening storage and avoiding contact with corrosive media.

 

2.HR3C

The composition of HR3C is based on ASME SA213 TP310H, a new steel grade designed to improve the lasting strength by adding the right amount of Nb and N. Developed by Sumitomo Metals, Inc. and designated as “Fire SUS310J1TB” in the Japanese METI specification, HR3C was confirmed by ASME code case 2115 and incorporated into the ASME SA213M specification as TP310HCbN, with the American grade S31 042. DMV grade DMV310N.

 

3.Sanicro25

Sanicro25 is a new austenitic steel developed by Swedish Sandvik, the main component is 22Cr- 25Ni-3.5W-3Cu. High temperature strength is higher than HR3C, and after aging brittleness is significantly better than HR3C. high temperature oxidation resistance, good corrosion performance. Organizational stability, processing performance is good.

 

Super304H stainless steel tube (shot peening) in ultra-supercritical power station boiler has a wide range of application prospects. sanicro25 (S31035) stainless steel tube in 650 C high parameter power station boiler will be used in large quantities. Large-diameter stainless steel tubes are not recommended for use in high-parameter power station boilers on the collector box and piping components