1021BA

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1021BA · 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 · carbon 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：0.3333–0.4833Known-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）：≥ 0.2290Known-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：0.2650–0.3675Known-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	0.18 ～ 0.23
Si	≤ 0.1 (lower limit not stated)
Mn	0.8 ～ 1.1
Ni	≤ 0.2 (lower limit not stated)
Cr	0.1 ～ 0.2
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.