News & Technical Articles – Oilfield Steel Insights | ShunFu Metal

News & Technical Articles – Oilfield Steel Insights | ShunFu MetalHarris Lee2026-06-10T06:55:44+00:00

Offshore Valve-Body Steel: Why Continuous-Cast Bloom + Forging Beats the Ingot Route

What the patent actually protects — and why it should change how you specify offshore valve-body steel When an international EPC or OCTG buyer evaluates Chinese valve-body steel, the first question is always the same: which

SUP13Cr Billet Selection: Forged vs Continuous-Cast Tubing

In Chinese specifications, the super-martensitic 13Cr-5Ni-2Mo stainless used for CO2 oilfield tubing is called SUP13Cr. The same alloy is UNS S41426 in the US system and, in the European super-martensitic family, EN 1.4414. The 110-grade tube

AISI 4130 Pipeline Weld: Why the Thermal Envelope, Not the Filler, Decides Integrity

A 4130 pipeline weld is decided by the thermal envelope, not by the filler When a buyer audits an AISI 4130 (Chinese 30CrMo) pipeline weld, the instinct is to check two certificates: the base-pipe MTR and

4130 Round Billet Internal Cracks: The 900–750 °C Straightening Mistake, Not the Melt

A 4130 round billet's internal cracks are decided on the caster, not in the melt When a buyer rejects a AISI 4130 or Chinese 30CrMo round billet for "internal cracks," the reflex is to blame the

4130X in 50 MPa Hydrogen: The Design Numbers Aren’t on the MTR

"4130X" Is a Chinese Hydrogen-Service Variant of a Five-Standard Cr-Mo Family The steel in the source paper is 4130X, a Chinese Cr-Mo grade developed for large-volume seamless high-pressure hydrogen storage vessels. The material standard is GB/T

4130 Valve Body: Why Heat Treatment Decides 75K Quality

A Valve Body Stamped "4130" Travels Across Five Standards — and Five Chemistry Windows The Chinese grade in the source paper is GB/T 3077 30CrMo, with carbon 0.26-0.34 %, manganese 0.40-0.70 %, chromium 0.80-1.20 % and

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