T/UNP 604-2025 Forging Specification for Low-Plasticity Steel Forgings

Scope

Main technical content: This standard clarifies the basic requirements for forging: equipment needs regular maintenance, parameters must meet the process requirements and have overload protection; the tensile strength of the mold material shall be ≥800MPa, and the hardness shall be HRC48-52. It shall be preheated to 200-350℃ before use; operators need professional training. The forging process includes process design, billet preparation (preferably using electroslag remelted steel ingots, with the depth of surface defect grinding ≤1/2 of the machining allowance), heating (temperature 880-1200℃, insulation for 1.5h/100mm thickness), deformation (rate 0.05-0.5mm/s, total forging ratio ≥5), mold lubrication, and slow cooling and timely heat treatment after forging. Quality control includes process parameter monitoring, visual inspection, and data traceability. Inspection is divided into raw materials (chemical composition, mechanical properties, etc.), process (parameters, appearance, dimensions), and finished product inspection (mechanical properties, metallography, non-destructive testing, etc.). The marking must be clear and durable, and the packaging should be moisture-proof, rust-proof, and collision-proof.

Development Information

Related Standards