19MNB4

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 19MNB4 →

19MnB4 · NF EN 10269:1999

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: Original-standard record
Standard edition: NF EN 10269:1999
Table / clause: EN 10269:1999 Table 1 and footnotes 1 and 2
PDF page references: 2、21、23

Carbon-equivalent reference

IIW / CEV：0.3033–0.4317 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）：0.2140–0.3358Known-element contribution; incomplete value; missing Cu, Cr, Ni, Mo, V 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：0.2500–0.3550 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	0.17 ～ 0.24
Si	≤ 0.4 (lower limit not stated)
Mn	0.8 ～ 1.15
P	≤ 0.035 (lower limit not stated)
S	≤ 0.035 (lower limit not stated)
Al	≥ 0.02 (upper limit not stated)
B	0.0008 ～ 0.005

Applicability and limitations

The cover of NF EN 10269:1999 explicitly adopts EN 10269:1999; Preserve the correspondence between the French adoption version and the European version; do not label as other countries or new editions. ; Table 1 gives heat-analysis mass percentages; Single values in P and S columns are upper limits; other single values are parsed according to the inequality signs in the original table; Unspecified elements shall not be filled as zero. ; Applies to billets, bars and wire rod of steels and nickel alloys for fasteners with specified high- or low-temperature properties.; Cold heading and actual supply must be verified in conjunction with delivery condition, dimensions, and process. ; Table 1 Footnote 1: Elements not listed in the table shall not be intentionally added without the buyer's consent (except additions needed to finish steelmaking); Elements that affect properties must be prevented from being introduced via scrap steel, etc.. ; This record only verifies the heat analysis composition in Table 1; product analysis tolerances in Table 2 shall not be automatically added to the heat limits.

Combined limits

Combined-element limits

19MnB4 · BEXG 021-2020

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

Material category: Cold-heading steel
Subcategory: Cold-heading steel
Material form: Wire rod
Original record status: Manufacturer source verified
Document edition: BEXG 021-2020, sixteenth revision stated on the cover; issued and effective on 2020-12-29; The latest original document available on this computer only
Document title: Technical delivery conditions for cold-heading steel wire rod for automotive parts
Table / clause: Table 1
PDF page references: 5
Unit: Mass fraction (wt%)
Manufacturer: Baoshan Iron & Steel Co., Ltd. (Baosteel)

Carbon-equivalent reference

Estimate from manufacturer-published ranges, not a standard guarantee or measured heat result; formula applicability requires review against the application and process.

IIW / CEV：0.3300–0.5320Known-element contribution; incomplete value; missing V 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）：0.2290–0.3598Known-element contribution; incomplete value; missing V 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：0.2700–0.3885 Envelope of independent element limits from manufacturer data; neither standard guarantee values nor measured heat results 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	0.18 ～ 0.23
Si	≤ 0.3 (lower limit not stated)
Mn	0.9 ～ 1.2
P	≤ 0.025 (lower limit not stated)
S	≤ 0.025 (lower limit not stated)
Cr	≤ 0.3 (lower limit not stated)
B	0.0008 ～ 0.005
Cu	≤ 0.25 (lower limit not stated)
Ni	≤ 0.2 (lower limit not stated)
Mo	≤ 0.06 (lower limit not stated)

Applicability and limitations

Baosteel BEXG 021-2020, Table 1, row 36, PDF page 5; heat-analysis composition in wt%, hot-rolled wire rod. 2020 is the original edition available locally, with no claim that it is the company’s current latest edition. Special conditions and actual supply require separate confirmation.

Composition conditions

Table 1 and its continuation give heat composition, in mass fractions wt%; The product is hot-rolled wire rod for automotive parts.
Unless expressly stated otherwise, residual Cr≤0.20%, Ni≤0.20%, Cu≤0.20% and Mo≤0.06% apply; Specific requirements in the table and additional notes take precedence.
A dash does not mean zero; Composition outside the table is not inferred from grade names or referenced standards.

Verification notes

Table 1 original images checked page by page, physical pages 3–10; continuation values and other columns kept separate; two disputed rows excluded.

Source footnotes

B：0.0008-0.0050，Cu≤0.25View associated products →