15-5PH Turning Scrap/ 17-4 Turning Scrap/ 630 Turning Scrap

Product Description

15-5PH / 17-4PH / Grade 630 Material Overview

15-5PH (UNS S15500 / XM-12) and 17-4PH (UNS S17400 / AISI 630) are chromium-nickel-copper precipitation-hardening martensitic stainless steels. Both alloys provide high strength, hardness, and excellent corrosion resistance. 17-4PH (Grade 630) is the most widely used precipitation-hardening steel, while 15-5PH is a ferrite-free refinement designed for improved transverse toughness and forging capability.

Chemical Composition Comparison

Mechanical & Physical Properties

Turning Scrap & Machining Chip Characteristics

• Types of Turning Scrap: Machining chips, lathe swarf, CNC borings, milling turnings, centerless grinding sludge, and drill shavings.

• Key Quality & Processing Specifications:

  • Degreasing & Oil Moisture Content: Clean turning scrap must be centrifuge-processed or thermally dried to remove soluble machining oils, coolants, and moisture prior to melting.

  • Briquetted / Compacting Grade: Loose turnings are often hydraulically compressed into dense briquettes or pucks to increase bulk density and prevent rapid oxidation in induction furnaces.

  • Ferromagnetic Property: Fully magnetic in both solution-annealed and age-hardened conditions, enabling easy mechanical crane handling and sorting from non-ferrous metals.

  • PMI / Chemistry Verification: XRF spectrographic analysis is essential to verify copper content (2.5% to 5.0%) and separate 15-5PH/17-4PH turnings from standard non-copper martensitics (like 410, 420, or F6NM) and austenitic grades (304, 316).

Key Industry Standards & Specifications

• AMS Standard: AMS 5643 (17-4PH Bars/Forgings), AMS 5659 (15-5PH Bars/Forgings), AMS 5604 (17-4PH Sheet/Plate)

• ASTM Standard: ASTM A564 (Grade 630 / Grade XM-12), ASTM A693, ASTM A705

• UNS Designation: UNS S17400 (17-4PH / Grade 630), UNS S15500 (15-5PH / XM-12)

• EN / W.Nr Standard: 1.4542 (17-4PH / X5CrNiCuNb16-4), 1.4545 (15-5PH)

• HS Code: 7204.49 (Stainless Steel Scrap) / 7222.11 (Stainless Steel Bars)