Steel Pipes Spec Table
Steel pipes are round-section steel products used for piping, structural members, and fluid conveyance. Carbon steel pipe (KS D 3507) is most widely used for water, steam, and gas lines; stainless steel pipe is used in food, pharmaceutical, and semiconductor lines requiring corrosion resistance and hygiene. Wall thickness is selected by schedule (Sch) number.
Frequently Asked Questions
What is the difference between carbon steel pipe and stainless steel pipe?
Carbon steel pipe (SGP) is cheaper and suitable for general piping but susceptible to corrosion. Stainless steel pipe (SUS304/316) excels in corrosion resistance and hygiene for food, medical, and chemical piping — at higher cost.
What is the difference between pipe size notation A and B?
A (mm) and B (inch) are different notations for the same pipe. E.g., 25A = 1B (approx. 1 inch). These are nominal sizes, not actual bore — check the spec table for actual OD and ID.
How do I choose between SUS304 and SUS316 piping?
SUS304 suits general corrosion environments (water, air, mild acids). SUS316 has added molybdenum for superior resistance to chlorides, brine, and strong acids — used in marine and chemical plants.