Cold Heading Engineer
Engineering screening for drawings, blank volume, station risks and material routes.
Open engineer →ENGINEERING TOOLS · CHQ WIRE
Engineering Software & Tools
Use the basic calculators free in your browser, with no installation or sign-up.
After the toolbox loads and caches its files online, these tools work offline: strength unit conversion, steel hardness conversion, tensile strength estimates from hardness, round wire area and weight, and drawing reduction ratio.
Installation steps for computers and phones
- Computer · Chrome / Edge — Select the install icon in the address bar, or install the page as an app from the browser menu.
- Mac · Safari — Choose Share → Add to Dock (macOS 14 or later).
- Android · Chrome — In the Chrome menu, choose Install or Add to Home screen and follow the prompts.
- iPhone / iPad · Safari — Choose Share → Add to Home Screen. Turn on Open as Web App if shown, then tap Add.
If you are viewing this page inside a messaging app, open it in your system browser first.
After installation, open the toolbox once from its icon while online and let the page finish loading. Material selection, metallography analysis, online drawing recognition and technical enquiries require a connection.
17 FREE ENGINEERING CALCULATORS
Engineering calculators — choose a task
Use the existing and additional tools on this page free of charge. Select a task to reach its inputs; each tool explains its formula, units and applicability.
ENGINEERING SOFTWARE & TOOLS
Engineering software directory
Choose your software or calculator. Online calculations remain free.
Engineering calculators
Strength units, hardness, tensile estimates, wire area and weight, and drawing reduction.
Browse all 17 calculators →Export and saved results
Installation and watermarked previews are free. Clean exports require membership; saving requires a verified email.
Open member services →04 · IMAGEJ · TRIAL
Metallographic Inclusion Pre-Analysis
Original-image checks, scale calibration, field measurements, explanations and operator review. The current trial does not issue formal standard ratings.
Open the Chinese-language trial →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.
Carbon equivalent calculator
Enter measured composition in wt%. Leave unknown values blank; enter 0 only when zero is confirmed. For boron, 10 ppm = 0.001%.
IIW / CEV
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15IIW/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 + 5BPcm: mainly low-carbon, low-alloy steels; confirm applicability, particularly when C exceeds 0.11%.
CET
CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40CET: 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.
Method reference: TWI
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.Steel hardness conversion
ISO 18265:2013 Table A.1, ten Brinell, Vickers, Rockwell and superficial Rockwell scales. No extrapolation.
Calculation data: ISO 18265:2013 Table A.1. Material, structure, heat treatment, test force and scale affect the result; formal acceptance requires the applicable standard table or an actual test.Hardness and tensile estimate
ISO 18265:2013 Table A.1 lookup and linear interpolation for unalloyed/low-alloy steels and cast steel. Estimates do not replace tensile testing.
Linear interpolation; no extrapolation. HV means HV10. Microhardness, case hardness, Leeb HL and Shore HS/HA/HD are excluded. Historical HB≤450 used steel balls; HB/HBW equivalence is approximate. Not for acceptance.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