18CR2NI4W
2 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 18CR2NI4W →18Cr2Ni4W · GB/T 3077-2015
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Alloy steel
- Subcategory
- Alloy structural steel
- Material form
- Reference record
- Original record status
- Original standard verified
- Standard edition
- GB/T 3077-2015
- Table / clause
- Tables 1 and 2; A/E designation rules in the endnote to Table 1
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.13 ～ 0.19 |
| Mn | 0.3 ～ 0.6 |
| Cr | 1.35 ～ 1.65 |
| Ni | 4.0 ～ 4.5 |
| Si | 0.17 ～ 0.37 |
| W | 0.8 ～ 1.2 |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| Mo | ≤ 0.1 (lower limit not stated) |
Applicability and limitations
GB/T 3077-2015 Table 1 gives ladle analysis; Table 2 gives P/S and residual-element requirements. The final note to Table 1 allows ordering any grade as higher or special quality by adding A or E after the grade; this record is ordinary quality steel. For steel used in hot-pressure working, Cu ≤0.20%; the ordinary Cu maximum does not apply to this use. Explicit alloy ranges in Table 1 take priority; for Cr/Ni/Mo not specified there, use the residual limits in Table 2 and do not add residual limits on top of alloying-element ranges. Sn/Sb/As must be analyzed and recorded on the inspection certificate; any needed limits require agreement, and no generic numerical limits are invented here. Product-analysis deviations are handled separately under GB/T 222 and do not directly expand ladle limits. Mechanical properties depend on specimen dimensions and the recommended heat-treatment/delivery condition; this composition review does not constitute verification of properties.
Verification notes
Tables 1/2 and quality-grade rules checked18Cr2Ni4W · GB/T 3078-2019
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Alloy steel
- Subcategory
- Alloy structural steel
- Material form
- Cold-drawn bars
- Original record status
- Original standard verified
- Standard edition
- GB/T 3078-2019
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.13 ～ 0.19 |
| Mn | 0.3 ～ 0.6 |
| Cr | 1.35 ～ 1.65 |
| Ni | 4.0 ～ 4.5 |
| Si | 0.17 ～ 0.37 |
| W | 0.8 ～ 1.2 |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| Mo | ≤ 0.1 (lower limit not stated) |
Applicability and limitations
Clause 7.1.1 of GB/T3078—2019: quality carbon structural steels comply with GB/T699, and alloy structural steels with GB/T3077; the referenced composition standard must also be displayed. This grade is listed in row 72 of Table 2. Hardness for each delivery condition is listed separately under Table 2; the actual application and delivery condition require separate verification and are not assumed to comply. Cold-drawn steel bars/cold-drawn polished round bars: product-analysis deviations under GB/T222 require separate verification and are not added to heat-analysis ranges. In GB/T3077-2015, Table 1 gives heat analysis and Table 2 gives P/S and residual-element requirements. The final note to Table 1 permits all grades to be ordered as higher or special quality, with the respective suffixes A/E; this record uses the default quality-steel class. Steel for hot pressure working: Cu≤0.20%; the ordinary Cu upper limit does not apply to that use. Explicit alloy ranges in Table 1 take precedence. Where Cr/Ni/Mo is not explicitly specified, the residual limits in Table 2 apply; residual limits are not added to specified alloy-element ranges. Sn/Sb/As must be analysed and recorded on the inspection certificate, with limits agreed where needed; no universal numerical limit is invented here. Product-analysis deviations under GB/T222 are used separately and do not directly widen heat-analysis ranges. Mechanical properties depend on specimen dimensions and the recommended heat-treatment/delivery conditions; this composition review does not establish verification of mechanical properties.
Verification notes
GB/T 3078-2019 Table 2 grade rows and the clause 7.1.1 reference checked; composition comes from the verified GB/T 3077-2015 original, not a separate composition table in GB/T 3078.Hardness in the delivery condition (conditions shown separately)
GB/T 3078-2019 · Table 2 hardness in delivery condition and Note a; 7.3/7.4 · PDF pages 6, 7 · HBW
Standard condition data, not actual measured results of supplied heats; Actual delivery condition, application, and contract must be confirmed.
- Clause 7.3.1: The specific delivery condition shall be stated in the contract; if it is not specified, delivery shall be in the cold-drawn condition.
- 7.4.1 Hardness for delivery in the normalized condition shall be agreed by both parties; the two general-use columns in Table 2 do not apply to the normalized condition.
- Values in parentheses are for reference and are not acceptance criteria.
- 7.4.2 Hot-pressure-working applications are subject to separate limits; do not automatically apply the general condition in Table 2.
- 7.4.2 For hot-pressure working, supplied in the cold-drawn condition: 50Mn2, 35CrMnSi, 42CrMo and 35CrMoV per Table 2; 38CrSi and 38CrMoAl ≤285 HBW; other grades ≤269 HBW. Confirm the actual use; the ordinary Table 2 condition cannot replace this condition.
- 7.4.3 No hardness test is performed when the nominal cross-sectional dimension (diameter, thickness or diagonal length) is below 5 mm. At the purchaser’s request, stated in the contract, tensile strength may be used instead of hardness; the specific requirements shall be agreed by both parties. This clause provides no automatic conversion relationship.
Cold-drawn or cold-drawn and bright-polished delivery; Table 2 conditions are for general use. For hot-pressure-working applications, check clause 7.4.2 separately.
Reference values in parentheses in the original table shall not be used as a basis for judgment: HBW ≤ 285 (lower limit not listed) HBW
Delivery in the annealed, bright-annealed, high-temperature-tempered or tempered-after-normalizing condition; delivery as-normalized is excluded and shall be agreed by both parties under 7.4.1.
HBW：≤ 269 (lower limit not stated) HBW