20NICRMOS2
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 20NICRMOS2 →20NiCrMoS2 · ISO 683-18-1996
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Alloy steel
- Subcategory
- Case-hardening steel
- Material form
- Reference record
- Original record status
- Original standard verified
- Standard edition
- ISO 683-18-1996
- Table / clause
- Table3 and footnote 1–5; 7.2.2.1–7.2.2.2
- PDF page references
- 6、11、12、13
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.17 ～ 0.23 |
| Si | 0.15 ～ 0.4 |
| Mn | 0.65 ～ 0.95 |
| P | ≤ 0.035 (lower limit not stated) |
| S | 0.02 ～ 0.04 |
| Cr | 0.3 ～ 0.65 |
| Mo | 0.15 ～ 0.25 |
| Ni | 0.4 ～ 0.7 |
Applicability and limitations
ISO 683-18:1996 Bright non-alloy and low-alloy steel products, Table 3 Heat analysis of carburizing steels, mass fraction wt%; This is not a composition confirmation of the 2014 edition. ; This source is a 13-page public excerpt from the official version; complete composition rows and 5 footnotes from Table 3 have been obtained.; Without Table 4 product-analysis tolerances, Tables 7/8 hardenability data and Chapter 8 compositions of steels for quenching and tempering, verification of the entire standard must not be claimed complete.. ; Currently displaying the range for common grades in Table 3. When hardenability requirements are specified, Footnote 1 allows limited deviations except for P/S, with C not exceeding ±0.01% and other elements subject to Table 4; The absence of Table 4 shall not automatically relax ranges, nor shall it be used for the acceptance of H grades. ; Machinability may be improved by adding lead or controlling sulfide shape upon request; Where lead values are not specified, they shall not be filled as zero or assigned an arbitrary range. ; For other carburizing steels, see ISO 683-11:1987; Different suffix names in the 2014 edition shall not be automatically regarded as the same grade in the 1996 edition. ; A lower Si may be agreed upon during inquiry and ordering, provided the impact on mechanical properties is considered; The base ranges in Table 3 are currently used; do not remove the Si lower limit arbitrarily.. ; Elements not listed in the table must not be assumed to have zero content.; Unlisted elements shall not be intentionally added without the buyer's consent (except additions needed to finish steelmaking), and elements affecting properties introduced via scrap steel etc. shall be prevented. ; Clause 7.2.2.1 stipulates that Table 3 is used for heat analysis; Product-analysis tolerances are given in Table 4, which has not been obtained.. Clause 5.1.2 requires killed steel. Carbide spheroidizing annealing conditions required for cold-heading/cold-extrusion are covered separately by ISO 4954; cold-heading applicability cannot be determined solely by composition.