SNC631RCH

Based on Table 1/2 of the official Japanese original version of JIS G3509-1:2021, heat analysis mass fraction wt%; This record covers feedstock wire rod; it does not automatically establish the delivery properties or supply of processed WCH wire.. Ordinary RCH, hardenability-guaranteed HRCH, and agreed H1/H2 shall be recorded separately; Chemical ranges for H-class shall follow independent rows in this edition and shall not be automatically widened based on ordinary compositions. Cu≤0.30% for all grades in the table; Do not enter 0 for Mo marked with a dash or for unlisted elements; they must not be intentionally added except as needed to finish steelmaking.; Al addition for grain refinement shall be by agreement. Si is 0.15—0.35% by default; lower limits below 0.15% are adopted by agreement only; This record retains the default range; agreed Si values require separate verification against the actual specified values.. Product analysis deviations shall be verified separately according to the referenced JIS G0321 Table 4; heat limits shall not be treated as product analysis limits. Clause 7.1 applies only when specified by the purchaser. Average ferritic/total decarburized-layer depths: d≤15mm, ≤0.02/0.12mm; 15<d≤25mm, ≤0.02/0.15mm; 25<d≤32mm, ≤0.02/0.20mm; 32<d≤40mm, ≤0.03/0.25mm; 40<d≤50mm, ≤0.03/0.30mm; d>50mm, subject to agreement.. Clause 7.2: Non-metallic inclusion requirements apply only when specified by the purchaser. Use Table 4 of this edition and the corresponding JIS G0555 cleanliness methods; do not automatically equate these with ASTM E45.. Default surface defect depth ≤ 0.10mm; Stricter surface and dimensional accuracy shall be per agreement. Ordinary RCH in this record does not automatically carry the HRCH hardenability guarantee.; Fixed tensile strength and delivery hardness are not specified by the chemical table.

The original English edition JIS G 3509-1:2003, main-text Table 1, lists SNC631RCH as nickel-chromium steel; the product form in this record is low-alloy steel wire rod for cold heading. ; Main-text Table 2 gives heat-analysis mass percentages; The default Si is 0.15–0.35%; a lower bound below 0.15% requires purchaser-supplier agreement and is not the default minimum. ; Main-text Table 2, remark 1: impurity requirement Cu≤0.30% applies to all grades; Remark 2: grain-refining Al is added only by agreement; Product-analysis tolerances follow JIS G 0321, Table 4, only when agreed between the parties. ; Actual grades in this edition are displayed separately from later editions such as 2005/2010/2021; the historical edition does not establish current-standard requirements or actual supply.

China Steel bar and wire-rod catalogue CAT.NO.3-BD-01-2014-C1, PDF page 17

printed page 15, 7.1.8 JIS G3509-1 (continued table). The original catalogue does not explicitly identify the analysis type for this table. Historical manufacturer range data, not guaranteed standard limits or heat-specific measurements; this does not establish supply by Creation Group. Condition, note spanning pages: the Si minimum may be reduced below 0.15 by agreement, and Al may be added for grain refinement; Currently follows the Si range in the main table; no Al limit is inserted without a source.