3 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.
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
Material category
Tool steels
Subcategory
Alloy steel
Material form
Reference record
Original record status
Composition basis in the adopted standard verified
Standard edition
ISO 4957-2018
Table / clause
Table 4 · Notes a–g
PDF page references
15、16
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Default S≤.030%; Tabulated Ni range
IIW / CEV：1.0167–1.2667Known-element contribution; incomplete value; missing V, Cu 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）：0.5367–0.6850Known-element contribution; incomplete value; missing Cu, V, B 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：0.6075–0.7700Known-element contribution; incomplete value; missing Cu 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.
Default S≤.030%; Ni omitted by agreement; no range specified
IIW / CEV：0.9567–1.1867Known-element contribution; incomplete value; missing V, Ni, Cu 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）：0.5217–0.6650Known-element contribution; incomplete value; missing Cu, Ni, V, B 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：0.5850–0.7400Known-element contribution; incomplete value; missing Cu, Ni 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.
Agreed S .050–.100%; Tabulated Ni range
IIW / CEV：1.0167–1.2667Known-element contribution; incomplete value; missing V, Cu 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）：0.5367–0.6850Known-element contribution; incomplete value; missing Cu, V, B 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：0.6075–0.7700Known-element contribution; incomplete value; missing Cu 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.
Agreed S .050–.100%; Ni omitted by agreement; no range specified
IIW / CEV：0.9567–1.1867Known-element contribution; incomplete value; missing V, Ni, Cu 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）：0.5217–0.6650Known-element contribution; incomplete value; missing Cu, Ni, V, B 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：0.5850–0.7400Known-element contribution; incomplete value; missing Cu, Ni 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
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Applicability and limitations
DIN EN ISO 4957:2018-11 adopts EN ISO 4957:2018 (ISO 4957-2018); See the data basis for the actual composition source file and table number. Table 4 heat composition for cold-work alloy tool steels, wt%; Default P/S are each ≤.030%. ; Product-analysis tolerances in Table 5 must not be applied to the default heat-analysis range. ; Unlisted elements must not be intentionally added without purchaser consent, except additions needed to finish steelmaking; dashes are not entered as zero. ; Cold-work tool steel does not establish suitability for cold-heading wire; the words “cold work” alone do not justify listing a product in the product centre. ; Note f: by agreement, S .050–.100% applies and Ni may be omitted; An omission does not mean Ni=0.
Original condition-branch records
Default S≤.030%; Tabulated Ni range
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Default S≤.030%; Ni omitted by agreement; no range specified
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Agreed S .050–.100%; Tabulated Ni range
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
0.05 ～ 0.1
Agreed S .050–.100%; Ni omitted by agreement; no range specified
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
P
≤ 0.03 (lower limit not stated)
S
0.05 ～ 0.1
A condition branch must be selected
Yes
Verification notes
The official adoption relationship and original corresponding ISO composition have been checked; The complete main text of DIN has not been checked page by page
40CrMnNiMo8-6-4 · ISO 4957-2018
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
Material category
Nickel and nickel alloys
Subcategory
Alloy steel
Material form
Reference record
Original record status
Original standard verified
Standard edition
ISO 4957-2018
Table / clause
Table 4 · Notes a–g
PDF page references
15、16
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Default S≤.030%; Tabulated Ni range
IIW / CEV：1.0167–1.2667Known-element contribution; incomplete value; missing V, Cu 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）：0.5367–0.6850Known-element contribution; incomplete value; missing Cu, V, B 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：0.6075–0.7700Known-element contribution; incomplete value; missing Cu 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.
Default S≤.030%; Ni omitted by agreement; no range specified
IIW / CEV：0.9567–1.1867Known-element contribution; incomplete value; missing V, Ni, Cu 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）：0.5217–0.6650Known-element contribution; incomplete value; missing Cu, Ni, V, B 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：0.5850–0.7400Known-element contribution; incomplete value; missing Cu, Ni 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.
Agreed S .050–.100%; Tabulated Ni range
IIW / CEV：1.0167–1.2667Known-element contribution; incomplete value; missing V, Cu 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）：0.5367–0.6850Known-element contribution; incomplete value; missing Cu, V, B 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：0.6075–0.7700Known-element contribution; incomplete value; missing Cu 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.
Agreed S .050–.100%; Ni omitted by agreement; no range specified
IIW / CEV：0.9567–1.1867Known-element contribution; incomplete value; missing V, Ni, Cu 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）：0.5217–0.6650Known-element contribution; incomplete value; missing Cu, Ni, V, B 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：0.5850–0.7400Known-element contribution; incomplete value; missing Cu, Ni 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
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Applicability and limitations
Table 4 heat composition for cold-work alloy tool steels, wt%; Default P/S are each ≤.030%. ; Product-analysis tolerances in Table 5 must not be applied to the default heat-analysis range. ; Unlisted elements must not be intentionally added without purchaser consent, except additions needed to finish steelmaking; dashes are not entered as zero. ; Cold-work tool steel does not establish suitability for cold-heading wire; the words “cold work” alone do not justify listing a product in the product centre. ; Note f: by agreement, S .050–.100% applies and Ni may be omitted; An omission does not mean Ni=0.
Original condition-branch records
Default S≤.030%; Tabulated Ni range
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Default S≤.030%; Ni omitted by agreement; no range specified
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Agreed S .050–.100%; Tabulated Ni range
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
0.05 ～ 0.1
Agreed S .050–.100%; Ni omitted by agreement; no range specified
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
P
≤ 0.03 (lower limit not stated)
S
0.05 ～ 0.1
A condition branch must be selected
Yes
Verification notes
Official English Table 4 and footnotes visually checked.
40CrMnNiMo8-6-4 · BS EN ISO 4957:2018
Chemical-composition source verified. Properties and delivery conditions follow the sources and conditions stated here; actual supply and measured heat results are not verified by this reference.
Material category
Tool steel
Product form
Tool-steel standard reference; product form subject to the order
Standard edition
BS EN ISO 4957:2018
Table / clause
Table 4 and notes a–g
Source file
BS EN ISO 4957-2018-Tool steel.docx
Units
Mass fraction (wt%)
Analysis type
Cast analysis
Composition (agreed alternatives apply)
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Default S≤.030%; tabulated Ni range
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Default S≤.030%; Ni omitted by agreement, with no specified range
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
P
≤ 0.03 (lower limit not stated)
S
≤ 0.03 (lower limit not stated)
Agreed S .050–.100%; tabulated Ni range
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
Ni
0.9 ～ 1.2
P
≤ 0.03 (lower limit not stated)
S
0.05 ～ 0.1
Agreed S .050–.100%; Ni omitted by agreement, with no specified range
Element
Composition requirement
C
0.35 ～ 0.45
Si
0.2 ～ 0.4
Mn
1.3 ～ 1.6
Cr
1.8 ～ 2.1
Mo
0.15 ～ 0.25
P
≤ 0.03 (lower limit not stated)
S
0.05 ～ 0.1
Applicability and limitations
Cast analysis, mass fraction %. A dash means the standard gives no separate requirement; it does not mean zero. Unlisted elements shall not be intentionally added without purchaser consent, except additions needed to finish steelmaking. Permissible product-analysis deviations do not expand the default cast-analysis limits. Tool-steel classification and hardness depend on application, heat treatment and test conditions; they do not establish cold-heading suitability or guarantee properties in an arbitrary condition. Table 4: alloy cold-work tool steels; cast analysis, wt%; default P and S each ≤.030%. Product-analysis deviations in Table 5 must not be applied to the default cast-analysis limits. Unlisted elements shall not be intentionally added without purchaser consent, except to finish steelmaking. Dashes are not entered as zero. Note f: S .050–.100% may be agreed and Ni may be omitted. Omission does not mean Ni=0. Annealed and cold-drawn (+A+C) hardness may be 20 HBW higher than annealed (+A) hardness. Hardness values for different conditions must not be interchanged.
Composition and ordering conditions
Cast analysis, mass fraction %. A dash means the standard gives no separate requirement; it does not mean zero.
Unlisted elements shall not be intentionally added without purchaser consent, except additions needed to finish steelmaking.
Permissible product-analysis deviations do not expand the default cast-analysis limits.
Tool-steel classification and hardness depend on application, heat treatment and test conditions; they do not establish cold-heading suitability or guarantee properties in an arbitrary condition.
Table 4: alloy cold-work tool steels; cast analysis, wt%; default P and S each ≤.030%.
Product-analysis deviations in Table 5 must not be applied to the default cast-analysis limits.
Unlisted elements shall not be intentionally added without purchaser consent, except to finish steelmaking. Dashes are not entered as zero.
Note f: S .050–.100% may be agreed and Ni may be omitted. Omission does not mean Ni=0.
Annealed and cold-drawn (+A+C) hardness may be 20 HBW higher than annealed (+A) hardness. Hardness values for different conditions must not be interchanged.
Mechanical properties and delivery condition
Property
Standard requirements and applicable conditions
Usual delivery condition
Quenched and tempered, approximately 300 HBW (Table 4 note e); this is not a maximum annealed hardness.
Mechanical-property provenance：BS EN ISO 4957:2018 · Table 4 and notes a–g · Standard tables embedded in the Word document supplied by the user
Verification notes
Checked against the standard text and table notes supplied by the user. Applicability to a specific order requires separate confirmation.
