C40

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.

Open condition selection, comparison and carbon-equivalent tools for C40 →

C40 · DIN 17200-1987

Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results

Material category: Carbon steel
Subcategory: Carbon steel
Material form: Reference record
Original record status: Original standard verified
Standard edition: DIN 17200-1987-03
Table / clause: Table 2 and footnotes 1–5; 7.3.1–7.3.2
PDF page references: 1、2、15、16、17

Carbon-equivalent reference

Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.

Base composition in Table 2; the leaded condition in note 5 has not been ordered

IIW / CEV：0.4533–0.5733 Known-item contribution, not a complete value; missing Cr, Mo, 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）：0.3950–0.4933 Known-item contribution, not a complete value; missing Cu, Cr, Ni, Mo, 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：0.4200–0.5200 Known-item contribution, not a complete value; missing Mo, Cr, 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.

Only when expressly ordered by the purchaser under note 5: Pb0.15–0.30%

Composition record (conditional branches apply; this is not an unconditional requirement)

Element	Composition requirement
C	0.37 ～ 0.44
Mn	0.5 ～ 0.8
Si	≤ 0.4 (lower limit not stated)
P	≤ 0.045 (lower limit not stated)
S	≤ 0.045 (lower limit not stated)

Applicability and limitations

Table 2 cast analysis, mass fraction wt%; Si is an upper limit and unspecified elements are not filled with zero. P/S requirements for the C, Ck and Cm series remain separate; S 0.020–0.035% in S-containing grades is a two-sided range. Note 1: unlisted elements may not be intentionally added without purchaser consent, except to complete melting; no fixed residual values are inferred. Table 3 contains permissible product-analysis deviations, not added to cast limits; applicable sizes and positive/negative directions are checked separately. Heat-treatment condition, hardenability and size-dependent properties require separate verification. The standard includes hot-rolled wire rod; chemistry alone is no cold-heading supply commitment. Note 2: small composition deviations, excluding P/S, may be agreed when ordering restricted hardenability bands or quenched-and-tempered/normalized properties, but may not exceed Table 3. These data retain the Table 2 baseline without automatic relaxation. Light-typeface grades in note 4 are for special applications only. Note 5 permits separate ordering of Pb 0.15–0.30% only for the marked C-series grades; not added to ordinary base compositions. Original material number 1.0511; Note 4: special applications only.

Original condition-branch records

Base composition in Table 2; the leaded condition in note 5 has not been ordered

Element	Composition requirement
C	0.37 ～ 0.44
Mn	0.5 ～ 0.8
Si	≤ 0.4 (lower limit not stated)
P	≤ 0.045 (lower limit not stated)
S	≤ 0.045 (lower limit not stated)

Only when expressly ordered by the purchaser under note 5: Pb0.15–0.30%

Element	Composition requirement
C	0.37 ～ 0.44
Mn	0.5 ～ 0.8
Si	≤ 0.4 (lower limit not stated)
P	≤ 0.045 (lower limit not stated)
S	≤ 0.045 (lower limit not stated)
Pb	0.15 ～ 0.3

A condition branch must be selected

Yes

Verification notes

March 1987, Table 2 and all footnotes transcribed; mechanical properties checked separately.

C40 · Ovako Product Catalogue CO-117 ENG 24:07 (2024)

Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results

Material category: Carbon steel
Subcategory: Carbon steel
Material form: Bars, tubes, rings and precomponents
Composition basis: Manufacturer typical/nominal values, not guaranteed ranges
Original record status: Manufacturer source verified
Document edition: CO-117 ENG 24:07 ©Ovako 2024
Document title: Ovako Product Catalogue
PDF page references: 44
Unit: Interpreted as mass fraction (%) using other documents from the same manufacturer; the unit is not explicitly stated in this table
Analysis type: Typical composition analysis
Manufacturer: Ovako

Source document

Carbon-equivalent reference

Manufacturer typical single values are composition references only; no range estimate is made. They are neither standard guarantees nor measured heat results; Formula applicability requires review against the intended use and process.

IIW / CEV: manufacturer typical/nominal single values are shown for reference only; standard-range carbon equivalent is not calculated

Pcm (Ito–Bessyo): manufacturer typical/nominal single values are shown for reference only; standard-range carbon equivalent is not calculated

CET: manufacturer typical/nominal single values are shown for reference only; standard-range carbon equivalent is not calculated

Composition

Element	Composition requirement
C	Typical/nominal value 0.4 (not a guaranteed range)
Si	Typical/nominal value 0.2 (not a guaranteed range)
Mn	Typical/nominal value 0.7 (not a guaranteed range)

Applicability and limitations

Ovako 2024 product catalogue, PDF page 44; manufacturer’s typical analysis, for composition reference only. The original header does not explicitly state units; interpreted using the manufacturer’s mass-fraction % information. Neither standard guaranteed values nor measured heat analysis. Excluded from limit-based reverse search and carbon-equivalent calculation; blanks and element names alone in the other-elements field are not filled with 0. Manufacturer code: C40R.

Conditional requirement

Footnote
Units
Source conditions
The original table header does not state units explicitly; interpreted as mass fraction % using the manufacturer’s official chemistry information. This table does not itself print wt%.
Footnote
Typical analysis
Source conditions
All values are manufacturer’s typical single values, not limits or measured heat analysis; not used for limit-based reverse search or standard-range carbon equivalent.
Footnote
Grade designation
Source conditions
An asterisk after the original grade indicates a non-official EN standard designation, named only according to EN10027. This does not complete verification of the cited standard originals or editions.

Verification notes

All 170 rows of the 2021 original table were visually checked. Values in corresponding 2024 cells are unchanged; recognition differences were reviewed separately. Rows with conflicting values under the same code are excluded; values are not mixed across sections.

Source notes

Suitable for surface induction hardening to 600 HV

C40 · DIN EN 10277:2018-09

Original table in an informative annex verified; normative composition requirements and edition still require verification. For reference only.

Material category: Carbon steel
Subcategory: Carbon steel
Material form: Reference record
Composition basis: Heat analysis in an informative annex; for reference only
Verification status: Original table in an informative annex verified; normative composition requirements and edition still require verification
Standard edition: DIN EN 10277:2018-09
Table / clause: Informative Annex A.1
PDF page references: 42
Unit: mass fraction (wt%)
Analysis type: Heat analysis (informative reference)

Carbon-equivalent reference

Composition from an informative standard annex is for reference only. Normative composition and edition remain unverified; standard-range carbon equivalents and reverse matching are disabled.

Composition

Element	Composition requirement
C	0.37 ～ 0.44
Si	0.1 ～ 0.4
Mn	0.5 ～ 0.8
P	≤ 0.045 (lower limit not stated)
S	≤ 0.045 (lower limit not stated)
Cr	≤ 0.4 (lower limit not stated)
Mo	≤ 0.1 (lower limit not stated)
Ni	≤ 0.4 (lower limit not stated)
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

The original informative-annex table has been checked and is for reference only. Clause 7.1.2 requires chemical composition to be determined under the cited standard; the formal normative composition and applicable edition remain unverified. Do not use it as a delivery guarantee, a reverse-search acceptance criterion or a basis for standard-range carbon equivalent.

Composition conditions

The original informative-annex table has been checked and is for reference only. Clause 7.1.2 requires chemical composition to be determined under the cited standard; the formal normative composition and applicable edition remain unverified. Do not use it as a delivery guarantee, a reverse-search acceptance criterion or a basis for standard-range carbon equivalent.
Footnote b: raising S to approximately 0.10% or adding Pb must follow the enquiry requirements; When S is increased, the Mn maximum may be increased by 0.15%; this is not applied automatically.
Footnote c: raising the S maximum to 0.005% requires agreement, sulfide treatment and Ca≥0.0020%; this is not enabled by default.
Footnote d: exemption from the N maximum requires Alt≥0.020%, acid-soluble Al≥0.015% or sufficient other nitrogen-binding elements, stated in the certificate; This is not enabled on the basis of missing Al.
Footnote e: Cu>0.40% may cause hot cracking during hot forming; Footnote f: reducing Si requires alternative deoxidation measures.

Combined limits

Element-sum limits

Elements concerned
- Cr
- Mo
- Ni
Upper limit
0.63
Additional source notes
0,63

Conditional requirement

Footnote
Informative boundary
Source conditions
The original informative annex table has been checked and is for reference only; Main-text 7.1.2 requires chemical composition to be determined under the referenced standards; the normative composition and applicable editions still require verification. It must not be used as a delivery guarantee, reverse-matching criterion or basis for carbon equivalent calculated from standard composition ranges. Main-text references: EN 10025-2 and EN ISO 683-1 (undated references; applicable editions awaiting verification).
Footnote
Original-table condition 1
Source conditions
Footnote b: raising S to approximately 0.10% or adding Pb must follow the enquiry requirements; When S is increased, the Mn maximum may be increased by 0.15%; this is not applied automatically.
Footnote
Original-table condition 2
Source conditions
Footnote c: raising the S maximum to 0.005% requires agreement, sulfide treatment and Ca≥0.0020%; this is not enabled by default.
Footnote
Original-table condition 3
Source conditions
Footnote d: exemption from the N maximum requires Alt≥0.020%, acid-soluble Al≥0.015% or sufficient other nitrogen-binding elements, stated in the certificate; This is not enabled on the basis of missing Al.
Footnote
Original-table condition 4
Source conditions
Footnote e: Cu>0.40% may cause hot cracking during hot forming; Footnote f: reducing Si requires alternative deoxidation measures.