SCR430H2RCH
1 source records. Standards, editions and conditions are presented separately; matching grade names do not establish interchangeability.
Refer to each source for mass fractions and analysis type. Missing values are not treated as 0. Manufacturer typical values, standard guarantees and measured heat results must remain separate. Use the material selector for calculations and condition selection.
Open condition selection, comparison and carbon-equivalent tools for SCR430H2RCH →SCr430H2RCH · JIS G 3509-1-2021
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Low-alloy steel wire rod for cold heading; special hardenability designation by agreement under JA.1
- Original record status
- Original standard verified
- Standard edition
- JIS G 3509-1:2021
- Table / clause
- Clause4/Table1; Clause6/Table2 including residual Cu note; AnnexJA.1, conditional designation inherits HRCH chemistry
- PDF page references
- 6、7、8、36、37、38
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.27 ～ 0.33 |
| Si | 0.15 ～ 0.35 |
| Mn | 0.55 ～ 0.95 |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Ni | ≤ 0.25 (lower limit not stated) |
| Cr | 0.85 ～ 1.25 |
| Cu | ≤ 0.3 (lower limit not stated) |
Applicability and limitations
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. This grade is a special hardenability mark that must be adopted by agreement in the normative annex JA.1; H1 denotes the upper 75% of the corresponding HRCH band, and H2 the lower 75%; these are neither heating-process identifiers nor fixed delivery hardness values.. Chemical composition shall adopt Table 2 of the corresponding HRCH of this edition; The upper and lower hardenability limits at each distance still await verification and incorporation; composition alone does not establish an H1/H2 guarantee.