Q355D
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 Q355D →Q355D · GB /T 1591-2018
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
- Reference data; original source not verified
- Standard edition
- GB/T 1591-2018
- Table / clause
- Table 1 · Notes a–g
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Table 1, nominal thickness or diameter ≤40mm column; Notes a and b must also be checked; at thickness >30mm, the C≤0.22% requirement in note b applies
Table 1, nominal thickness or diameter >40mm column; Sections with thickness >100mm require separate agreement
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.55 (lower limit not stated) |
| Mn | ≤ 1.6 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Cu | ≤ 0.4 (lower limit not stated) |
Applicability and limitations
For sections and bars, the P and S maxima may each be increased by 0.005%. ; The Nb of Q390 and Q420 may reach a maximum of 0.07%, and the Nb of Q460 may reach a maximum of 0.11%; V and Ti may reach a maximum of 0.20%. ; When acid-soluble aluminum Als≥0.015%, total aluminum Alt≥0.020%, or other nitrogen-fixing alloying elements are present, N is unrestricted; Nitrogen-fixing elements must be specified in the quality certificate. ; For sections with a nominal thickness greater than 100mm, the C shall be negotiated between the supplier and the purchaser. ; The ≤40mm column in the table header includes Note b: for steel with a nominal thickness greater than 30mm, C ≤0.22%; Note b shall not be ignored to judge solely by the table header range. ; For Q355B, C ≤0.24% in the table; for Q355C/D, C ≤0.20% in the ≤40mm column and C ≤0.22% in the >40mm column; Simultaneously verify Note a, b and the actual form.
Original condition-branch records
Table 1, nominal thickness or diameter ≤40mm column; Notes a and b must also be checked; at thickness >30mm, the C≤0.22% requirement in note b applies
| Element | Composition requirement |
|---|---|
| C | ≤ 0.2 (lower limit not stated) |
| Si | ≤ 0.55 (lower limit not stated) |
| Mn | ≤ 1.6 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Cu | ≤ 0.4 (lower limit not stated) |
Table 1, nominal thickness or diameter >40mm column; Sections with thickness >100mm require separate agreement
| Element | Composition requirement |
|---|---|
| C | ≤ 0.22 (lower limit not stated) |
| Si | ≤ 0.55 (lower limit not stated) |
| Mn | ≤ 1.6 (lower limit not stated) |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | ≤ 0.3 (lower limit not stated) |
| Ni | ≤ 0.3 (lower limit not stated) |
| Cu | ≤ 0.4 (lower limit not stated) |
A condition branch must be selected
YesVerification notes
The original standard, Table 1 has been checked; Applicable dimensions and footnotes must be used togetherQ355D · 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 | ≤ 0.15 (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 | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.025 (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.