1. Delivery conditions and applicable requirements
Table B.1 – Combinations of heat-treatment condition at delivery, product form and applicable requirements
| Delivery condition | Symbol | Wire rod | Bar | Wire |
|---|---|---|---|---|
| Hot rolled or peeled | +AR or +PE | X | X | X |
| Cold drawn | +AR+C | — | X | X |
| Cold drawn and spheroidize annealed | +AR+C+AC | — | X | X |
| Cold drawn, spheroidize annealed and lightly cold drawn | +AR+C+AC+LC | — | X | X |
| Spheroidize annealed or spheroidize annealed and peeled | +AC or +AC+PE | X | X | X |
| Spheroidize annealed and cold drawn | +AC+C | — | X | X |
| Treated to a ferrite-pearlite structure and specified hardness range | +FP | — | X | — |
X = applicable; — = not applicable.
Other delivery conditions may be agreed at the time of order.
Applicable requirements according to the basis of order
| Ordered with reference to steel names in the tables | Requirement |
|---|---|
| B.2, B.3, B.4 or B.5 | Chemical composition according to B.2; mechanical properties according to B.3, B.4 and B.5. |
| B.2, B.3, B.4, B.5, B.6 or B.7 | Chemical composition according to B.2; mechanical properties according to B.3, B.4 and B.5; hardenability values according to B.6 and B.7. |
Supplementary or special requirements under Annex E apply if agreed at the time of enquiry and order.
Source: ISO 4954:2018, Table B.1, page 22. This table gives the standard relationship between product form, delivery condition and requirements; actual supply must be confirmed separately.
2. Chemical composition
Table B.2 – Chemical composition of case-hardening steels (cast analysis)
These are the standard’s reference requirements for cast analysis of 10NiCr5-4, not analysis results for a particular heat. The order standard and requirements for raw material and finished product must be confirmed separately.
| Element | Mass fraction, % |
|---|---|
| C | 0.07–0.12 |
| Si | ≤0.30 |
| Mn | 0.60–0.90 |
| P | ≤0.025 |
| S | ≤0.025 |
| Cr | 0.90–1.20 |
| Ni | 1.20–1.50 |
| Mo | — |
| B | — |
| Cu | ≤0.25 |
Elements not listed must not be intentionally added without the purchaser’s agreement, except for finishing the heat. Appropriate precautions are required to prevent additions from scrap or other production materials of elements that could impair hardenability, mechanical properties or suitability.
Al of 0.020–0.050% may be added to improve cold-heading performance.
a: Single values are maximum limits unless otherwise indicated. A dash does not mean zero content.
b: For steels with hardenability requirements under Tables B.6 and B.7, small departures from the specified limits are permitted, except for sulfur and phosphorus. Departures must not exceed 0.01% for carbon or the values in Table 2 for the other elements.
c: A lower silicon content or a specified silicon range may be agreed at the time of order.
Source: ISO 4954:2018, Table B.2, page 24 (PDF page 30). The table and notes do not replace the complete standard.
3. Mechanical properties
Table B.5 – Mechanical properties of alloy steels
| Steel name | Diameter | Delivery condition | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| +AC | +FP | +AR+C+AC | +AR+C+AC+LC | +AC+C | ||||||||
| over, mm | up to and including, mm | Rm max., MPa | Z min., % | HB min. | HB max. | Rm max., MPa | Z min., % | Rm max., MPa | Z min., % | Rm max., MPa | Z min., % | |
| 10NiCr5-4 | 2 | 5 | — | — | — | — | 520 | 64 | 560 | 62 | — | — |
| 10NiCr5-4 | 5 | 10 | 520 | 62 | 137 | 187 | 500 | 64 | 540 | 62 | 640 | 59 |
| 10NiCr5-4 | 10 | 40 | 520 | 62 | 137 | 187 | 500 | 64 | 540 | 62 | 630 | 59 |
Source: ISO 4954:2018, Table B.5, page 27. Rm is tensile strength; Z is reduction of area at fracture. HB denotes Brinell hardness where specified. The values apply only to the specified diameter intervals and delivery conditions.
4. Hardenability requirements
Table B.7 – Hardness limits for steels with restricted hardenability bands (+HH and +HL)
| Steel name | Symbol | Austenitizing temperature, °C (±5 °C) | Limit | Hardness, HRC, at distance from the quenched end, mm | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | ||||
| 10NiCr5-4 | +HH | 880 | max. | 41 | 39 | 37 | 34 | 32 | 30 | — | — | — | — | — | — | — |
| 10NiCr5-4 | +HH | 880 | min. | 33 | 29 | 26 | 24 | 21 | 20 | — | — | — | — | — | — | — |
| 10NiCr5-4 | +HL | 880 | max. | 38 | 35 | 32 | 30 | 27 | 25 | — | — | — | — | — | — | — |
| 10NiCr5-4 | +HL | 880 | min. | 32 | 27 | 24 | 22 | — | — | — | — | — | — | — | — | — |
Source: ISO 4954:2018, Table B.7, page 32.
Source note: Table B.6 uses the steel name 10NiCr5, whereas Table B.7 uses 10NiCr5-4. Values in B.6 have therefore not been automatically assigned to 10NiCr5-4 here. This difference in designation requires clarification against the standard before the values are used.
These values are standard references for the specified test conditions. They do not confirm availability, suitability for a particular cross-section or a production heat-treatment procedure. Delivery requirements require technical assessment.