国产免费XXX视频在线观看,国产精品九色Av,无每日更新在线观看AV_免费高清自慰区_99久久精品

A2 OR A4 STAINLESS STEEL?

Time:2021-04-30
Q: Should I choose A2 or A4 stainless steel balls

Q: Should I choose A2 or A4 stainless steel balls

A: A) Prioritize choosing the standard-compliant A2 (commonly known as 304) stainless steel. Generally speaking, it can meet the requirements of most usage environments.

B) In environments with higher corrosion requirements, such as petrochemical, chemical, nuclear power, and coastal areas, consider selecting A4 (commonly known as 316) stainless steel balls.

Next: End