Strength unit conversion
Exact unit conversion for MPa (N/mm²), kgf/mm², psi and ksi. 1 MPa = 1 N/mm².
Conversion follows unit definitions and does not establish a material or fastener property class.ENGINEERING TOOLS · CHQ WIRE
Cold Forming Engineering Tools
Quick calculators for wire area, weight, reduction ratio and RFQ readiness. Final acceptance depends on standards, drawings and inspection reports.
Quick estimates
Make the first check clearer
These tools support early discussion only. Formal acceptance must follow the applicable standard, drawing, customer specification and inspection report.
Steel hardness conversion
Enter HRB, HV, HBW or HRC. HRB/HV cover the softer ranges commonly used for annealed wire and cold-heading steel; HRC covers higher quenched-and-tempered ranges.
Engineering reference scope: ASTM E140-12B(2019)e1, ISO 18265:2013, GB/T 33362-2016 and GB/T 1172-1999. Material, structure, heat treatment, test force and scale affect the result; formal acceptance requires the applicable standard table or an actual test.HBW and tensile estimate
For preliminary discussion of carbon and low-alloy steels: Rm ≈ 3.45 × HBW (MPa). Not for stainless steel, non-ferrous alloys, case-hardened layers or formal acceptance.
This correlation is an engineering estimate, not a property decision under ISO 898-1, GB/T 3098.1 or a customer specification.Round wire area and weight
Drawing reduction ratio
RFQ readiness check
- Grade and standard
- Size, tolerance and delivery condition
- Quantity, application, drawing or failure photos