Technical data for SWCHB331 Cold heading wire; applicable standard is JIS G 3508-2:2005. View the chemical composition, mechanical properties, and related technical requirements for the current grade.
Supply and technical review · Creation Group accepts supply and technical review enquiries for this product. Dimensions, delivery condition, quantity and inspection documents are confirmed in the order technical agreement after review.
Reference composition for the stated standard edition, not heat analysis. Confirm the order standard and the separate requirements for feedstock and finished product.
Source: JIS G 3508-2:2005 → JIS G 3508-1:2010 · SWRCHB331 · p.4
Element
Mass fraction / %
C
0.28~0.34
Si
0.10~0.35
Mn
0.70~1.00
P
≤0.030
S
≤0.030
B
≥0.0008
Cu
≤0.30
Ni
≤0.20
Cr
≤0.20
For all steel grades in this table, Cu shall not exceed 0.30%, Ni 0.20%, and Cr 0.20%. Note a) The lower limit for Si may be set to less than 0.10% by agreement between supplier and purchaser. b) The B content may be 0.0005% or higher by agreement between supplier and purchaser.
2. Hardenability
Table 3 Distance from quenched end and hardness
3. Mechanical properties of wire rod
Table 5 Mechanical properties of wire rod resulting from the DA process
Notes: 1. For wire diameters exceeding 20 mm, the tolerance is the value in Table 2 minus 5. No tolerance is specified for diameters of 3 mm or less. 2. 1 N/mm² = 1 MPa
4. Decarburized layer depth
Table 6 Permissible limits for average decarburized layer depth
Average decarburized layer depth
Wire diameter (mm)
Ferrite decarburized layer depth
Total decarburized layer depth
≤15
＜0.02
＜0.15
15＜d≤25
＜0.03
＜0.20
25＜d≤32
＜0.04
＜0.25
For SWCH30K to SWCH50K wire, when specified by the purchaser, the test in 10.3.1 shall be performed. The permissible limit for the average decarburized layer depth shall be in accordance with Table 4. However, for wire with a diameter exceeding 32 mm, the limits shall be agreed upon between the supplier and the purchaser.
5. Wire diameter tolerance and out-of-roundness
Table 7 Tolerances and out-of-roundness for wire diameter
Table 7 Wire diameter tolerances and deviations
Unit: mm
Wire diameter
Permissible deviation
Out-of-roundness
≤3
0-0.025
0.013
3<d≤6
0-0.030
0.013
6<d≤10
0-0.036
0.013
10<d≤18
0-0.043
0.013
18<d≤30
0-0.070
0.013
30<d≤40
0-0.100
0.013
40<d≤50
0-0.150
0.013
Note (3) Out-of-roundness refers to the difference between the maximum and minimum diameters within the same cross-section of the wire.
TECHNICAL NOTE
Application and ordering note
Chemical composition, mechanical properties, delivery condition and other technical requirements are subject to the currently applicable standard edition, customer drawings and the order technical agreement. Website information does not replace formal quality certification documents.
RFQ CHECKLIST
What to include in the enquiry
Grade and applicable standard
Diameter or section, delivery condition and quantity
Part drawing, forming stations or failure photos, if available
Testing, certificate or report requirements
RELATED CAPABILITIES
Related manufacturing and quality capabilities
Carbon equivalent calculator — SWCHB331
Basis: JIS G 3508-2:2005
Chemical composition source: JIS G 3508-2:2005 → JIS G 3508-1:2010
Transcribed from the cited standard
Original source wording
Table 2
IIW / CEV
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15Known-element contribution, not a complete value: 0.3967–0.5800
Missing elements: Mo, V
IIW/CEV: carbon and low-alloy steel weldability screening.
Pcm (Ito–Bessyo)
Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5BKnown-element contribution, not a complete value: ≥ 0.3223
Missing elements: Mo, V
Pcm: mainly low-carbon, low-alloy steels; confirm applicability, particularly when C exceeds 0.11%.
CET
CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40Known-element contribution, not a complete value: 0.3500–0.4700
Missing elements: Mo
CET: ferritic-steel preheat assessment; confirm EN 1011-2 conditions.
A stated upper limit means 0 to that limit. A lower limit alone does not define an upper bound. Missing elements are unknown, not zero. Standard-limit combinations are not measured heat results.
Carbon equivalent supports weldability assessment; it does not approve cold heading, fastener strength or a welding procedure. These formulas do not directly apply to stainless steels, cast irons or non-ferrous metals.
