Q620D
1 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 Q620D →Q620D · 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)
IIW / CEV：0.0000–0.6973 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15; an engineering estimate of welding cold-cracking susceptibility for carbon and low-alloy steels.
Pcm（Ito–Bessyo）：0.0000–0.3870 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B; mainly used for low-carbon low-alloy steels, particularly modern low-carbon pipeline steels; more relevant when C is approximately no higher than 0.11%.
CET：0.0000–0.4475 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40; used in welding preheat assessment for ferritic steels, subject to the applicability conditions of EN 1011-2.
Cr/Ni/Cu are residual elements, each ≤0.30%; Based on total aluminum Al(t)≥0.020%
IIW / CEV：0.0000–0.6973 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15; an engineering estimate of welding cold-cracking susceptibility for carbon and low-alloy steels.
Pcm（Ito–Bessyo）：0.0000–0.3870 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B; mainly used for low-carbon low-alloy steels, particularly modern low-carbon pipeline steels; more relevant when C is approximately no higher than 0.11%.
CET：0.0000–0.4475 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40; used in welding preheat assessment for ferritic steels, subject to the applicability conditions of EN 1011-2.
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)
IIW / CEV：0.0000–0.9040 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15; an engineering estimate of welding cold-cracking susceptibility for carbon and low-alloy steels.
Pcm（Ito–Bessyo）：0.0000–0.4553 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B; mainly used for low-carbon low-alloy steels, particularly modern low-carbon pipeline steels; more relevant when C is approximately no higher than 0.11%.
CET：0.0000–0.5200 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40; used in welding preheat assessment for ferritic steels, subject to the applicability conditions of EN 1011-2.
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%
IIW / CEV：0.0000–0.9040 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15; an engineering estimate of welding cold-cracking susceptibility for carbon and low-alloy steels.
Pcm（Ito–Bessyo）：0.0000–0.4553 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B; mainly used for low-carbon low-alloy steels, particularly modern low-carbon pipeline steels; more relevant when C is approximately no higher than 0.11%.
CET：0.0000–0.5200 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40; used in welding preheat assessment for ferritic steels, subject to the applicability conditions of EN 1011-2.
Composition record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| C | ≤ 0.18 (lower limit not stated) |
| Si | ≤ 0.6 (lower limit not stated) |
| Mn | ≤ 2.0 (lower limit not stated) |
| Nb | ≤ 0.11 (lower limit not stated) |
| V | ≤ 0.12 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| Cr | ≤ 1.0 (lower limit not stated) |
| Ni | ≤ 0.8 (lower limit not stated) |
| Cu | ≤ 0.8 (lower limit not stated) |
| N | ≤ 0.015 (lower limit not stated) |
| Mo | ≤ 0.3 (lower limit not stated) |
| B | ≤ 0.004 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.025 (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 | ≤ 0.18 (lower limit not stated) |
| Si | ≤ 0.6 (lower limit not stated) |
| Mn | ≤ 2.0 (lower limit not stated) |
| Nb | ≤ 0.11 (lower limit not stated) |
| V | ≤ 0.12 (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 | ≤ 0.3 (lower limit not stated) |
| B | ≤ 0.004 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.025 (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 | ≤ 0.18 (lower limit not stated) |
| Si | ≤ 0.6 (lower limit not stated) |
| Mn | ≤ 2.0 (lower limit not stated) |
| Nb | ≤ 0.11 (lower limit not stated) |
| V | ≤ 0.12 (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 | ≤ 0.3 (lower limit not stated) |
| B | ≤ 0.004 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.025 (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 | ≤ 0.18 (lower limit not stated) |
| Si | ≤ 0.6 (lower limit not stated) |
| Mn | ≤ 2.0 (lower limit not stated) |
| Nb | ≤ 0.11 (lower limit not stated) |
| V | ≤ 0.12 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| Cr | ≤ 1.0 (lower limit not stated) |
| Ni | ≤ 0.8 (lower limit not stated) |
| Cu | ≤ 0.8 (lower limit not stated) |
| N | ≤ 0.015 (lower limit not stated) |
| Mo | ≤ 0.3 (lower limit not stated) |
| B | ≤ 0.004 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.025 (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 | ≤ 0.18 (lower limit not stated) |
| Si | ≤ 0.6 (lower limit not stated) |
| Mn | ≤ 2.0 (lower limit not stated) |
| Nb | ≤ 0.11 (lower limit not stated) |
| V | ≤ 0.12 (lower limit not stated) |
| Ti | ≤ 0.2 (lower limit not stated) |
| Cr | ≤ 1.0 (lower limit not stated) |
| Ni | ≤ 0.8 (lower limit not stated) |
| Cu | ≤ 0.8 (lower limit not stated) |
| N | ≤ 0.015 (lower limit not stated) |
| Mo | ≤ 0.3 (lower limit not stated) |
| B | ≤ 0.004 (lower limit not stated) |
| P | ≤ 0.03 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Al | ≥ 0.02 (upper limit not stated) |