40CR
13 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 40CR →40Cr · GB/T 3077-1999
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 3077-1999
- Table / clause
- Table 1, No. 30 and notes 1–4; Table 2; 6.1.1–6.1.2
- PDF page references
- 5、7、8
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis, not product analysis
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Quality steel; machining or other non-hot-pressure processing: Cu limit per Table 2.
Quality steel; hot-pressure working, clause 6.1.1.3: Cu ≤0.20%.
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Si | 0.17 ～ 0.37 |
| Mn | 0.5 ～ 0.8 |
| Cr | 0.8 ～ 1.1 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.035 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Mo | ≤ 0.15 (lower limit not stated) |
Applicability and limitations
GB/T 3077—1999, Table 1: ladle analysis, mass fraction wt%; this record follows the actual 1999 edition, not the 2015 edition. Grades without suffix A in the table are ordered as quality steel. Table 2 P/S/Cu and residual Mo follow the applicable quality grade; residual Cr/Ni/Mo limits do not override alloy contents specified in Table 1. The chemical composition also applies to ingots, billets and their products; bar scope, mechanical properties and surface-quality requirements do not by themselves guarantee suitability as cold-heading wire. If the processing use is not specified in the contract, machining applies; for hot-pressure processing, Cu≤0.20%, select the applicable condition. Under 6.1.1.2, residual W/V/Ti are analyzed and reported on the certificate; no common limit is stated for unlisted elements, so do not enter zero; Table 1 alloy ranges for W/V/Ti remain applicable. Table 1 Note 2: upgrading to A/E quality or specifying other chemistry by agreement requires a separate order check; do not merge grades or rewrite this row’s C range. Note 4: rare earth 0.05% is a calculated addition; product analysis is for reference, not a guaranteed range. Product-analysis tolerances for steel/billets are separately checked against cited GB/T 222—1984 and do not automatically relax ladle limits.
Original condition-branch records
Quality steel; machining or other non-hot-pressure processing: Cu limit per Table 2.
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Si | 0.17 ～ 0.37 |
| Mn | 0.5 ～ 0.8 |
| Cr | 0.8 ～ 1.1 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.035 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Mo | ≤ 0.15 (lower limit not stated) |
Quality steel; hot-pressure working, clause 6.1.1.3: Cu ≤0.20%.
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Si | 0.17 ～ 0.37 |
| Mn | 0.5 ～ 0.8 |
| Cr | 0.8 ～ 1.1 |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.035 (lower limit not stated) |
| Cu | ≤ 0.2 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Mo | ≤ 0.15 (lower limit not stated) |
A condition branch must be selected
YesVerification notes
The 1999 original images of Tables 1 and 2 and the related clauses were checked. Heat analysis, quality grade and hot-working conditions are retained as separate conditions.40Cr · 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 | 0.37 ～ 0.44 |
| Mn | 0.5 ～ 0.8 |
| Cr | 0.8 ～ 1.1 |
| Si | 0.17 ～ 0.37 |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 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 checked40Cr · 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 | 0.37 ～ 0.44 |
| Si | 0.17 ～ 0.37 |
| Mn | 0.5 ～ 0.8 |
| Cr | 0.8 ～ 1.1 |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Mo | ≤ 0.1 (lower limit not stated) |
Applicability and limitations
GB/T3078-2019, Clause 7.1.1: Quality carbon structural steel refers to GB/T699; alloy structural steel refers to GB/T3077.; The source of chemical composition must simultaneously display the referenced standard. ; Applies to cold-drawn steel bars and cold-drawn polished round bars.; Apply product-analysis tolerances under GB/T222 separately; do not incorporate them directly into heat-analysis ranges.. ; GB/T3077-2015 Table 2: This unsuffixed grade uses the quality-steel limits P/S≤0.030%, Cu≤0.30%, with Cu≤0.20% for hot working.; A/E quality grades are retained separately and shall not be merged under the same grade. ; Cr/Ni/Mo in Table 2 are residual element upper limits; For elements with specified alloy ranges in Table 1, use the Table 1 ranges; do not also apply conflicting residual upper limits.. ; Sn/Sb/As shall be analyzed and recorded in the quality certificate; limits shall be agreed upon when required, as the standard does not provide general values here.
Verification notes
The cited clauses in 3078 and the original texts of the referenced standards have been checked.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.
HBW：≤ 269 (lower limit not stated) 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：≤ 217 (lower limit not stated) HBW
40Cr · Q/BQB 517-2023
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Alloy steel
- Subcategory
- Cold-heading steel
- Material form
- Hot-rolled steel wire rod for cold heading
- Original record status
- Original standard verified
- Standard edition
- Q/BQB 517—2023
- Table / clause
- 6.1.1/Table 1, row 73, note a
- PDF page references
- 11
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.38 ～ 0.43 |
| Si | 0.18 ～ 0.35 |
| Mn | 0.6 ～ 0.9 |
| P | ≤ 0.02 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Cr | 0.9 ～ 1.2 |
| Ni | ≤ 0.2 (lower limit not stated) |
| Cu | ≤ 0.2 (lower limit not stated) |
| Mo | ≤ 0.06 (lower limit not stated) |
Applicability and limitations
Q/BQB 517—2023, official original on the Baosteel website, Table 1, row 73; cast-analysis mass fraction wt%. Table footnote a: residual Cr≤0.20, Ni≤0.20, Cu≤0.20, Mo≤0.06 wt%; where this row specifies otherwise, its requirement for that element takes precedence. Unlisted elements and special agreement requirements must not be treated as zero or assumed guarantees; permitted product-analysis deviations are governed separately by GB/T 222. Wire rod is delivered hot rolled; stricter P/S under Z1 and special surface or inclusion quality must be confirmed under normative Annex A and the contractual ordering codes. Fixed mechanical properties must not be inferred from the chemistry table.
Verification notes
All 104 rows of Table 1 and 34 rows of Table 2 in the original Q/BQB517:2023 from Baosteel’s official website were checked row by row; not mixed with older editions.View associated products →40Cr · BEXG 021-2020
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Cold-heading steel
- Subcategory
- Cold-heading steel
- Material form
- Wire rod
- Original record status
- Manufacturer source verified
- Document edition
- BEXG 021-2020, sixteenth revision stated on the cover; issued and effective on 2020-12-29; The latest original document available on this computer only
- Document title
- Technical delivery conditions for cold-heading steel wire rod for automotive parts
- Table / clause
- Table 1
- PDF page references
- 4
- Unit
- Mass fraction (wt%)
- Manufacturer
- Baoshan Iron & Steel Co., Ltd. (Baosteel)
Carbon-equivalent reference
Estimate from manufacturer-published ranges, not a standard guarantee or measured heat result; formula applicability requires review against the application and process.
Composition
| Element | Composition requirement |
|---|---|
| C | 0.38 ～ 0.43 |
| Si | 0.18 ～ 0.35 |
| Mn | 0.6 ～ 0.9 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | 0.9 ～ 1.2 |
| Ni | ≤ 0.2 (lower limit not stated) |
| Cu | ≤ 0.2 (lower limit not stated) |
| Mo | ≤ 0.06 (lower limit not stated) |
Applicability and limitations
Baosteel BEXG 021-2020, Table 1, row 13, PDF page 4; heat-analysis composition in wt%, hot-rolled wire rod. 2020 is the original edition available locally, with no claim that it is the company’s current latest edition. Special conditions and actual supply require separate confirmation.
Composition conditions
- Table 1 and its continuation give heat composition, in mass fractions wt%; The product is hot-rolled wire rod for automotive parts.
- Unless expressly stated otherwise, residual Cr≤0.20%, Ni≤0.20%, Cu≤0.20% and Mo≤0.06% apply; Specific requirements in the table and additional notes take precedence.
- A dash does not mean zero; Composition outside the table is not inferred from grade names or referenced standards.
Verification notes
Table 1 original images checked page by page, physical pages 3–10; continuation values and other columns kept separate; two disputed rows excluded.Source footnotes
-40Cr · GB /T 11251-2020
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Reference record
- Verification status
- Reference data; original source not verified
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Cr | 0.8 ～ 1.1 |
| Cu | ≤ 0.3 (lower limit not stated) |
| Mn | 0.5 ～ 0.8 |
| Mo | ≤ 0.1 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Si | 0.17 ～ 0.37 |
Applicability and limitations
A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.
40Cr · GB /T 17107-1997
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Reference record
- Verification status
- Reference data; original source not verified
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Cr | 0.8 ～ 1.1 |
| Cu | ≤ 0.3 (lower limit not stated) |
| Mn | 0.5 ～ 0.8 |
| Ni | ≤ 0.3 (lower limit not stated) |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.035 (lower limit not stated) |
| Si | 0.17 ～ 0.37 |
Applicability and limitations
A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.
40Cr · GB /T 37601-2019
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Reference record
- Verification status
- Reference data; original source not verified
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Cr | 0.8 ～ 1.1 |
| Cu | ≤ 0.3 (lower limit not stated) |
| Mn | 0.5 ～ 0.8 |
| Mo | ≤ 0.1 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Si | 0.17 ～ 0.37 |
Applicability and limitations
A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.
40Cr · JB /T 6396-2006
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Reference record
- Verification status
- Reference data; original source not verified
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Cr | 0.8 ～ 1.1 |
| Cu | ≤ 0.2 (lower limit not stated) |
| Mn | 0.5 ～ 0.8 |
| Ni | ≤ 0.3 (lower limit not stated) |
| P | ≤ 0.035 (lower limit not stated) |
| S | ≤ 0.035 (lower limit not stated) |
| Si | 0.17 ～ 0.37 |
Applicability and limitations
A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.
40Cr · JB /T 6908-2020
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Reference record
- Verification status
- Reference data; original source not verified
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Cr | 0.8 ～ 1.1 |
| Cu | ≤ 0.2 (lower limit not stated) |
| Mn | 0.5 ～ 0.8 |
| Ni | ≤ 0.3 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.03 (lower limit not stated) |
| Si | 0.17 ～ 0.37 |
Applicability and limitations
A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.
40Cr · Q/ASB 234-2018
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Reference record
- Verification status
- Reference data; original source not verified
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Cr | 0.8 ～ 1.1 |
| Mn | 0.5 ～ 0.8 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Si | 0.17 ～ 0.37 |
Applicability and limitations
A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.
40Cr · Q/BQB 135-2009
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Reference record
- Verification status
- Reference data; original source not verified
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Cr | 0.8 ～ 1.1 |
| Mn | 0.5 ～ 0.8 |
| P | ≤ 0.02 (lower limit not stated) |
| S | ≤ 0.015 (lower limit not stated) |
| Si | 0.17 ～ 0.37 |
Applicability and limitations
A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.
40Cr · Chinese national standard
Original-source verification is incomplete; this is not a formal standard reference
- Material category
- Alloy steel
- Subcategory
- Alloy steel
- Material form
- Reference record
- Verification status
- Reference data; original source not verified
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | 0.37 ～ 0.44 |
| Cr | 0.8 ～ 1.1 |
| Mn | 0.5 ～ 0.8 |
| P | ≤ 0.015 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Si | 0.17 ～ 0.37 |
Applicability and limitations
A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.