Q390E
5 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 Q390E →Q390E · GB /T 1591-1994
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
- Reference record
- Original record status
- Original standard verified
- Standard edition
- GB/T 1591—1994
- Table / clause
- 5.1.1/Table 1 + clauses 5.1.1.1—13
- PDF page references
- 1、3、4
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Mn | 1.0 ～ 1.6 |
| Si | ≤ 0.55 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| V | 0.02 ～ 0.2 |
| Nb | 0.015 ～ 0.06 |
| Ti | 0.02 ～ 0.2 |
| Al | ≥ 0.015 (upper limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.7 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
Applicability and limitations
GB/T 1591—1994, Table 1; Heat-analysis mass fractions wt%. Requirements from other current editions are not backfilled into this edition. V/Nb/Ti/Al in Table 1 are grain-refining elements; 5.1.1.6—8 requires at least one of C/D/E; A/B is optional and, when not added, is neither analyzed nor guaranteed; All four minima must not be imposed simultaneously as default requirements. For all 5.1.1.10 grades, residual Cr/Ni/Cu are each ≤0.30%; Table 1 of Q390/Q420/Q460 separately lists a Cr/Ni limit; interpret it according to whether the element is intentionally added as an alloying constituent. 5.1.1.4 sheet
hot-rolled strip has a thickness exception for the Mn minimum; The Nb minimum for 5.1.1.9 sections and bars is 0.005%; Special forms and contract conditions require manual review. This standard covers high-strength low-alloy structural steels; This does not establish cold-heading wire suitability, actual supply or a default mechanical-property guarantee. For 5.1.1.5 using Nb with mechanical properties guaranteed, the Q345/Q390 Mn minimum may be below Table 1. Al≥0.015% in Table 1 is total aluminum; In the 5.1.1.6 grain-refining combination, at least one element must meet its corresponding minimum; all elements are not simultaneously mandatory.
Combined limits
- Conditional composition lower limit
- V
- Nb
- Ti
- Al
Verification notes
Complete 7-page scan of edition 1994; Table 1 has 20 entries; Grain refinement and replacement ranges require manual interpretation.Q390E · GB/T 1591-2008
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Alloy steel
- Subcategory
- High-strength low-alloy structural steel
- Material form
- Reference record
- Original record status
- Original standard verified
- Standard edition
- GB/T 1591-2008
- Table / clause
- Table 1 · continued table · Notes a/b; 6.1.1–6.1.7
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Cr/Ni/Cu are residual elements, each ≤0.30%; Al in the table is acid-soluble aluminum Al(s)
Cr/Ni/Cu are residual elements, each ≤0.30%; Based on total aluminum Al(t)≥0.020%
Cr/Ni/Cu is intentionally added; the maximum in Table 1 is used; A separate agreement requires individual confirmation; Al in the table is acid-soluble aluminum Al(s)
Cr/Ni/Cu is intentionally added; the maximum in Table 1 is used; A separate agreement requires individual confirmation; Based on total aluminum Al(t)≥0.020%
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.5 (lower limit not stated) |
| Mn | ≤ 1.7 (lower limit not stated) |
| Nb | ≤ 0.07 (lower limit not stated) |
| V | ≤ 0.2 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.5 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| N | ≤ 0.015 (lower limit not stated) |
| Mo | ≤ 0.1 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Al | ≥ 0.015 (upper limit not stated) |
Applicability and limitations
Heat analysis, mass fractions wt%; Retain the identity of the 2008 edition; do not apply the 2018 edition.. ; When grain refining elements need to be added per 6.1.2, at least one of Al/Nb/V/Ti must be contained and specified in the quality certificate.; This clause does not provide mandatory general lower limits for all elements.. ; 6.1.4 When nitrogen-fixing alloying elements such as Al/Nb/V/Ti are added, N is not restricted, but the nitrogen-fixing elements must be specified.; If this condition is not selected, the N upper limit listed in the table is the default.. ; Table 1, Note a: For sections/bars, the P and S limits may each increase by 0.005%; the upper limit for quality class A may be 0.045%.; Cannot be used for other products.. ; Table 1 Note b: When grain refining elements are added in combination, Nb+V+Ti≤0.22% and Mo+Cr≤0.30%.; The individual-element upper limits cannot all be taken simultaneously.. ; Clause 6.1.6: RE is calculated as an addition of 0.02–0.20% of the molten-steel weight, not as guaranteed finished-product composition..
Combined limits
- Product-form exception
- P
- 0.005
- S
- 0.005
- Class A product-form upper limit
- Not stated
- Element-sum limits
- Conditional combined limit
- Elements concerned
- Nb
- V
- Ti
- Upper limit
- 0.22
- Elements concerned
- Mo
- Cr
- Upper limit
- 0.3
- Nitrogen-fixing exception conditions
- Yes
Original condition-branch records
Cr/Ni/Cu are residual elements, each ≤0.30%; Al in the table is acid-soluble aluminum Al(s)
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.5 (lower limit not stated) |
| Mn | ≤ 1.7 (lower limit not stated) |
| Nb | ≤ 0.07 (lower limit not stated) |
| V | ≤ 0.2 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| N | ≤ 0.015 (lower limit not stated) |
| Mo | ≤ 0.1 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Al | ≥ 0.015 (upper limit not stated) |
Cr/Ni/Cu are residual elements, each ≤0.30%; Based on total aluminum Al(t)≥0.020%
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.5 (lower limit not stated) |
| Mn | ≤ 1.7 (lower limit not stated) |
| Nb | ≤ 0.07 (lower limit not stated) |
| V | ≤ 0.2 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| N | ≤ 0.015 (lower limit not stated) |
| Mo | ≤ 0.1 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Al | ≥ 0.02 (upper limit not stated) |
Cr/Ni/Cu is intentionally added; the maximum in Table 1 is used; A separate agreement requires individual confirmation; Al in the table is acid-soluble aluminum Al(s)
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.5 (lower limit not stated) |
| Mn | ≤ 1.7 (lower limit not stated) |
| Nb | ≤ 0.07 (lower limit not stated) |
| V | ≤ 0.2 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.5 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| N | ≤ 0.015 (lower limit not stated) |
| Mo | ≤ 0.1 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Al | ≥ 0.015 (upper limit not stated) |
Cr/Ni/Cu is intentionally added; the maximum in Table 1 is used; A separate agreement requires individual confirmation; Based on total aluminum Al(t)≥0.020%
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.5 (lower limit not stated) |
| Mn | ≤ 1.7 (lower limit not stated) |
| Nb | ≤ 0.07 (lower limit not stated) |
| V | ≤ 0.2 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.5 (lower limit not stated) |
| Cu | ≤ 0.3 (lower limit not stated) |
| N | ≤ 0.015 (lower limit not stated) |
| Mo | ≤ 0.1 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Al | ≥ 0.02 (upper limit not stated) |
A condition branch must be selected
YesVerification notes
Original text of Table 1, notes a/b and the applicability conditions in Clause 6.1 checkedQ390E · 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 95, note a
- PDF page references
- 12
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
Original composition-element notation and analysis basis
- Al
- Original element symbol
- Alₜ
- Symbol extracted from the original source
- Alt
- Original table column heading
- Al t
- Subscript in the original source
- t
- Subscript explanation
- Only original table subscripts shall be retained; do not expand these into total aluminum or acid-soluble aluminum; Al without specified form shall not be directly equated
- Standard edition
- Q/BQB 517—2023
- Table / clause
- 1
- Original table item number
- 95
- PDF page references
- 12
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
- Original record status
- Original column symbol verified
- Original cell
- ≥ 0.015
When the original analysis designations differ, or a record leaves them unspecified, comparability or a match cannot be concluded directly. Subscripts not explained by the source are not expanded here.
Carbon-equivalent reference
Composition
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.55 (lower limit not stated) |
| Mn | 1.0 ～ 1.6 |
| P | ≤ 0.02 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Alₜ | ≥ 0.015 (upper limit not stated) |
| V | 0.02 ～ 0.2 |
| Nb | 0.015 ～ 0.06 |
| Ti | 0.02 ～ 0.2 |
| Ni | ≤ 0.7 (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 95; 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 →Q390E · 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 | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.55 (lower limit not stated) |
| Mn | 1.0 ～ 1.6 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| V | 0.02 ～ 0.2 |
| Nb | 0.015 ～ 0.06 |
| Ti | 0.02 ～ 0.2 |
| Al | ≥ 0.015 (upper limit not stated) |
| Ni | ≤ 0.7 (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 10, 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
V:0.02-0.20,Nb:0.015-0.060,Ti:0.02-0.20,Al:≥0.015,Ni:≤0.70View associated products →Q390E · GB /T 34199-2017
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 | ≤ 0.12 (lower limit not stated) |
| Mn | ≤ 1.6 (lower limit not stated) |
| N | ≤ 0.01 (lower limit not stated) |
| Nb | ≤ 0.07 (lower limit not stated) |
| Ni | ≤ 0.5 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.02 (lower limit not stated) |
| Si | ≤ 0.5 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| V | ≤ 0.15 (lower limit not stated) |
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.