35SMNPB20

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.

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35SMnPb20 · EN ISO 683-4-2018

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

Material category: Free-cutting steel
Subcategory: Free-cutting steel
Material form: Free-cutting steel semi-finished products, bars and wire rod; see delivery-state and dimensional conditions
Original record status: Original standard verified
Standard edition: EN ISO 683-4:2018
Table / clause: Table 2 and notes a–c; Table 3; 1,6.3,7.1,7.3
PDF page references: 1、5、7、10、13、14、15
Unit: Mass fraction (wt%)
Analysis type: Heat analysis

Carbon-equivalent reference

IIW / CEV：0.4700–0.6233 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）：0.3650–0.4733 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：0.4100–0.5300 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.

Composition

Element	Composition requirement
C	0.32 ～ 0.39
Si	≤ 0.4 (lower limit not stated)
Mn	0.9 ～ 1.4
P	≤ 0.06 (lower limit not stated)
S	0.15 ～ 0.25
Pb	0.15 ～ 0.35

Applicability and limitations

Based on the official EN ISO683-4:2018 text, consulted as DIN EN ISO683-4:2018-09; The European foreword confirms the adoption of ISO683-4:2016 without modification; 2018 is the EN adoption version year, while the adopted ISO version remains 2016. The scope includes semi-finished products, bar products, and wire rod of the free-cutting steels listed in Table 2; Bright bars shall refer separately to ISO683-18; standards for different products shall not be automatically conflated. Table 2 is for heat analysis; Verify Table 3 permissible product-analysis deviations separately only when required at ordering; deviations for the same heat must not exceed both the upper and lower limits in opposite ± directions. Grades containing Pb and grades without Pb shall be recorded separately; dashes shall not be filled as 0. The default low Si value for the non-heat-treated group shall be kept separate from the agreed Si 0.10–0.40% under special oxide guarantees; P shall be selected from a default maximum of 0.11%, an agreed range of 0.06–0.11%, or an agreed maximum of 0.05%; agreed conditions shall not be adopted automatically. Elements not listed shall not be intentionally added without the buyer's consent (except additions needed to finish steelmaking); Additions to improve machinability, such as Ca, Se, and Te, must be agreed upon and reported in the inspection documents; the complete carbon equivalent shall not be calculated based on missing items. Table 1: Untreated +U applies to semi-finished products, bar products, and wire rod; +QT delivery condition applies only to bar products listed in Table 1. Agreed properties for untreated products based on reference samples after heat treatment do not mean that wire rod has been quenched and tempered upon delivery. +U hardness in Tables 4–6 shall be kept separate from the tensile strength used for dispute arbitration; In case of dispute, determination shall be based on tensile strength; properties after quenching and tempering shall not be used to replace the untreated delivery condition. No values are listed for the first and last diameter intervals of +QT for 35SMn20/35SMnPb20 in Table 6; dashes shall not be filled as 0 or extrapolated from adjacent diameters; Parentheses for the first two hardness levels of the 44SMn28 group shall be retained as per the original text; the meaning of parentheses and the guarantee range shall be verified separately. Tensile specimens shall be according to Table 7 and ISO6892-1, with a proportional gauge length L0=5.65√S0; Sampling location, cross-section, inspection lot, and inspection document requirements shall be verified separately. According to 7.3, welding is generally not recommended for high S/P free-cutting steels; Suitability for cold heading or other cold forming must also be confirmed in conjunction with the actual material and agreement; material retrieval does not equal processing suitability or supply guarantee.

Verification notes

EN ISO683-4:2018, Table 2 and the agreed P/Si condition have been checked; The edition adopted by ISO is 2016; view properties by the selected delivery condition and diameter.

Rules for applying product-analysis deviations

Source table

Table 3

Analysis type

Product analysis only

C

Heat-analysis upper limit does not exceed
0.3
Permitted positive deviation
0.02
Permitted negative deviation
0.02
Heat-analysis upper limit greater than
0.3
Heat-analysis upper limit does not exceed
0.5
Permitted positive deviation
0.03
Permitted negative deviation
0.03

Si

Heat-analysis upper limit does not exceed
0.05
Permitted positive deviation
0.01
Permitted negative deviation
0.01
Heat-analysis upper limit greater than
0.05
Heat-analysis upper limit does not exceed
0.4
Permitted positive deviation
0.03
Permitted negative deviation
0.03

Mn

Heat-analysis upper limit does not exceed
1.0
Permitted positive deviation
0.04
Permitted negative deviation
0.04
Heat-analysis upper limit greater than
1.0
Heat-analysis upper limit does not exceed
1.7
Permitted positive deviation
0.06
Permitted negative deviation
0.06

P

Heat-analysis upper limit does not exceed
0.06
Permitted positive deviation
0.008
Permitted negative deviation
0.008
Heat-analysis upper limit greater than
0.06
Heat-analysis upper limit does not exceed
0.11
Permitted positive deviation
0.02
Permitted negative deviation
0.02

S

Heat-analysis upper limit does not exceed
0.33
Permitted positive deviation
0.03
Permitted negative deviation
0.03
Heat-analysis upper limit greater than
0.33
Heat-analysis upper limit does not exceed
0.4
Permitted positive deviation
0.04
Permitted negative deviation
0.04

Pb

Heat-analysis upper limit does not exceed
0.35
Permitted positive deviation
0.03
Permitted negative deviation
0.02

Both positive and negative deviations are permitted for the same heat

Used to relax heat-analysis requirements

35SMnPb20 · 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: Free-cutting 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.2
PDF page references: 44
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	0.32 ～ 0.39
Si	≤ 0.4 (lower limit not stated)
Mn	0.9 ～ 1.4
P	≤ 0.06 (lower limit not stated)
S	0.15 ～ 0.25
Pb	0.15 ～ 0.35

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.
Unlisted elements must not be intentionally added without purchaser consent; Machinability-improving additions such as Ca/Se/Te require agreement and must be stated in the certificate.
Footnote b: Si 0.10—0.40% is an agreed option for specific oxide control and does not replace the default Si maximum.
Footnote c: P 0.06—0.11% or ≤0.05% requires agreement at enquiry or ordering; Default original-table values are not rewritten automatically.

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 reference: EN ISO 683-4 (undated reference; applicable edition awaiting verification).
Footnote
Original-table condition 1
Source conditions
Unlisted elements must not be intentionally added without purchaser consent; Machinability-improving additions such as Ca/Se/Te require agreement and must be stated in the certificate.
Footnote
Original-table condition 2
Source conditions
Footnote b: Si 0.10—0.40% is an agreed option for specific oxide control and does not replace the default Si maximum.
Footnote
Original-table condition 3
Source conditions
Footnote c: P 0.06—0.11% or ≤0.05% requires agreement at enquiry or ordering; Default original-table values are not rewritten automatically.