St45.8 Manufacturing process

Posted:2018-08-07 11:04:12

1. Hot rolling (extrusion seamless steel pipe): round billet → heating → perforation → three-roll cross-rolling, continuous rolling or extrusion → pipe removal → sizing (or reducing diameter) → cooling → straightening → hydraulic test (or flaw detection) → mark → warehousing

2. Cold drawn (rolled) seamless steel pipe: round tube billet → heating → perforation → head → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening →Hydraulic pressure test (inspection)→marking→inbound

St45.8 Chemical Compositions of DIN 17175 steel pipes (%)

Grade	C	Si	Mn	P	S
St45.8	≤0.21	0.10-0.35	0.40-1.20	≤0.040	≤0.040

St45.8 Mechanical Properties of DIN17175 steel pipe

Grade	Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation(%)
St45.8	≥255	410-530	21

We promise we can offer you the qualified St45.8 at the competitive price and rapid delivery time. We can produce as our customer's requirement. We keep many St45.8 stock in our warehouse, so hereby, we sincerely hope you join us, let's join hands to make you be the No.1 in your local steel market.

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