Carbon structural steel Q195 is used to transport low pressure fluids

〣Introduction to carbon structural Steel Q195

This kind of steel is generally smelted by converter or open furnace, and its main raw material is molten iron and scrap steel. The content of sulfur and phosphorus in steel is higher than that of high-quality carbon structural steel, with sulfur ≤0.050% and phosphorus ≤0.045%. The content of other alloying elements, such as chromium, nickel and copper, brought into the steel by the raw material generally does not exceed 0.30%.International standard ISO: HR2(σs195).

〣Production technology

Q195 steel pipe is carbon structural steel, production process: arc welded pipe resistance welded pipe gas welded pipe furnace welded pipe.

Q195 weld pipe to transfer low pressure fluid. General welding pipe Q195A, Q215A, Q235A steel manufacturing. It can also be made of other mild steels which are easy to weld. Water pressure, bending, flattening and other experiments should be carried out on the steel pipe, which has certain requirements on the surface quality. Usually, the delivery length is 4-10m, and the delivery length is usually fixed (or multiple) feet. The specification of the welded pipe is expressed by the nominal diameter (mm or inch). The nominal diameter is different from the actual diameter. The welded pipe has two kinds of ordinary steel pipe and thickened steel pipe according to the specified wall thickness, and the steel pipe has two kinds of thread and no thread according to the form of the pipe end.

Q195 is a carbon structural steel. Yield strength 195MPA. Lower strength than Q235. The price is cheaper. Used in construction, structure, motorcycle price, etc. The ASTM brand is Gr.B(σs185). σs185 is a yield strength of 185MPa.

〣National production standards

China GB/T 700: Q195

International standard ISO: HR2(σs195)

The former Soviet Union-Oct: CT1K, then

SS330(SS34)(σs205)

German DIN: St33

UK BS: 040A10

French NF: A33

The Chinese national standard steel number Q195 stands for "yield strength σs=195MPa", which is measured by the experimental value of 16mm steel bar. If the diameter of the steel is 16~40mm, the yield limit is 185MPa, which is the naming rule adopted by ASTM.

【 Chemical Composition 】 (Mass fraction) (%)

C: 0.06-0.12

Mn: 0.25-0.50

Si: Not more than 0.30

S: No more than 0.050

P: ≦0.045

Deoxidation method: F, b, Z

〣parameter