1525BA

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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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1525BA · Kobe Steel manufacturer specifications (Section 6-13 boron steels)

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

Material category: Boron steels
Subcategory: Boron steels
Material form: Wire rod
Original record status: Manufacturer source verified
Document edition: Publication edition not stated in the document
Document title: Wire rod and bar specification tables
Table / clause: 6-13 · manganese boron steel
PDF page references: 32
Unit: Mass fraction (wt%)
Manufacturer: Kobe Steel

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：0.4200–0.5700Known-element contribution; incomplete value; missing Mo, 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）：≥ 0.2890Known-element contribution; incomplete value; missing Mo, V; B has no specified upper limit; the carbon-equivalent upper bound cannot be determined 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：0.3300–0.4325Known-element contribution; incomplete value; missing Mo 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	0.23 ～ 0.28
Si	≤ 0.1 (lower limit not stated)
Mn	0.9 ～ 1.2
Ni	≤ 0.2 (lower limit not stated)
Cr	0.2 ～ 0.3
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Cu	≤ 0.25 (lower limit not stated)
B	≥ 0.0008 (upper limit not stated)

Applicability and limitations

Kobe Steel manufacturer boron steel catalog Section 6-13 (PDF page 32) mass fraction wt% original table; Not the original JIS standard text. Similar JIS grades are for catalog reference only; cold heading and supply shall be confirmed separately.

Composition conditions

Main elements and table notes in the original Section 6-13: P/S≤0.030%, Cu≤0.25%, B≥0.0008%.; No upper limit given for B; do not guess.
Similar JIS G3508 grades are for manufacturer catalog reference only, and are not a guarantee of direct equivalence or substitution.
The manufacturer catalogue does not identify the publication edition; Do not confirm current supply based on this.

Verification notes

Principal elements, the Mo exception and common footnotes in the original manufacturer table were checked cell by cell; Unlisted elements are not filled with zero.