Sourcing Heat Treatment in China
What an industrial buyer needs to know before requesting quotations for heat treatment from China-based suppliers.
Overview
Sourcing heat treatment from China is one of the recurring decisions of any industrial buyer who needs to balance unit cost, quality control and lead time. This page collects what an EU buyer should know before opening a Request for Quotation for heat treatment suppliers in China: typical materials, tolerances expected on the drawing, certifications worth asking for, current price positioning and shipping turnaround.
From a pure cost angle, China prices heat treatment roughly 40–60% lower compared to the average European baseline. Real numbers depend on volume, alloy and surface treatment, but this gap is what justifies a sourcing exercise toward China in the first place. Cost is rarely the only variable: lead time, audit access, certifications and supplier capacity at the right volume usually decide which suppliers actually make the shortlist.
A typical first article from a China-based heat treatment shop takes 7–21 working days, plus 25–40 shipping days of shipping to central Europe. Series production lead time depends on volume and capacity reservation: most established shops want a forecast horizon of 60 to 90 days to plan raw materials and surface treatment subcontractors.
When to choose this process
Always cite hardness HRC/HRB and depth requirements explicitly in the drawing.
Heat treatment changes the metallurgical structure of metals to reach target hardness, toughness or fatigue life. Process choice depends on alloy: through-hardening for 42CrMo4, case-hardening for 18NiCrMo5, vacuum for high-precision parts.
Why source here — China
- Lowest unit cost on high-volume programmes
- Vertically integrated supply chains (raw to packaged)
- Tooling-friendly: moulds and dies at 50–70% EU cost
- Mature export logistics, FOB/CIF/DAP all standard
What to watch out for
- Sea freight 25–40 days; air freight at 5–10× cost
- IP risk — use NNN agreements, fragment the BOM if critical
- QA dispersion: third-party inspection (SGS/BV/AsiaInspection) is mandatory
Typical materials
- Carbon and alloy steels
- Stainless
- Aluminium (T6, T7)
- Cast iron
- Titanium (annealing)
Typical tolerances
Hardness ±2 HRC; case depth ±0.1 mm; allow distortion budget on long parts.
Certifications to ask for
- CQI-9 (auto)
- NADCAP HT (aero)
- AMS 2750 pyrometry
- ISO 9001
- IATF 16949
- EN 9100
- RoHS, REACH on demand
Frequently asked questions
Is it worth sourcing heat treatment from China?
It pays off when the lower hourly rate (40–60% lower) beats the logistic friction (25–40 shipping days) and the selected supplier holds the required certifications (ISO 9001, IATF 16949). Below ~200 pcs/year it often doesn't; above ~1,000 pcs/year the math almost always tips in favour.
Will heat treatment distort my part?
Yes, slightly. Plan a finish grind/turn after treatment on critical bearing surfaces, and use jigs/fixtures for long thin parts.
Will Chinese tariffs/anti-dumping hit my part?
Check the EU TARIC code: anti-dumping on screws, steel pipes, aluminium wheels and many casts is in force. A licensed forwarder can pre-screen for free.
Other countries
Other processes
Editorial market guide. Supplyria is a marketplace; we don't list private suppliers on this page. Cost ranges and lead times are indicative and based on public industry benchmarks.