Starting a heat treating shop is one of the more capital-intensive moves in custom manufacturing — but for those who know the trade, it's also one of the most defensible businesses you can build. Demand from aerospace, automotive, tooling, and defense sectors runs deep and consistent. If you're serious about learning how to start a heat treating business, here's what actually matters.
Understand What Services You'll Offer First
Heat treating isn't a single process — it's a family of them. Before you spend a dollar on equipment, decide which services you'll lead with:
- Through hardening (quench and temper) for tool steels and structural parts
- Case hardening (carburizing, nitriding, carbonitriding) for gears and shafts
- Annealing and normalizing for stress relief and machinability
- Precipitation hardening for stainless steels and aluminum alloys
- Cryogenic treatment as a value-add for tooling and wear parts
Trying to do everything on day one is a trap. Most successful shops start with one or two processes — usually through hardening and annealing — then expand as revenue justifies it.
Equipment: What You Actually Need to Open
Your furnace is your business. A used batch atmosphere furnace from a reputable builder like Surface Combustion, AFC-Holcroft, or Ipsen runs $40,000–$150,000 depending on age, condition, and work zone size. A new unit can exceed $300,000.
Beyond the furnace itself, budget for:
- Quench tanks — oil, water, or polymer, depending on your process mix ($5,000–$25,000)
- Atmosphere generation or supply — endothermic generators or nitrogen/methanol systems
- Hardness testing equipment — Rockwell tester at minimum ($3,000–$8,000 new)
- Temperature uniformity survey (TUS) equipment — required for most certifications
- Safety systems — CO detectors, ventilation, fire suppression
- Material handling — baskets, fixtures, hoists, racks
Realistically, a modest but functional shop capable of handling small-to-medium batch work requires $200,000–$500,000 in equipment and facility buildout. Don't underestimate utilities — gas and electrical loads for industrial furnaces are substantial.
Certification: The Door to Serious Contracts
Without certification, you're limited to low-margin, low-scrutiny work. The certifications that actually open doors in this industry are:
- AMS 2750 (Nadcap) — mandatory for aerospace and defense suppliers; covers pyrometry standards and equipment calibration
- CQI-9 — required by most Tier 1 and Tier 2 automotive suppliers; covers process controls and record-keeping
- ISO 9001 — baseline quality management system; often required before a customer will even issue an RFQ
Nadcap accreditation in particular is a multi-month process that involves a rigorous on-site audit by PRI (Performance Review Institute). Plan for 6–12 months of preparation, internal process documentation, and equipment qualification before you're audit-ready. Many shops hire a quality consultant ($5,000–$15,000) to accelerate this process — it's usually worth it.
Finding Your First Clients
Your first 10 customers will likely come from relationships, not marketing. If you have a background in manufacturing or machining, start there — machine shops are natural referral partners because they need heat treating but rarely do it in-house.
Concrete first-client strategies:
- Call every machine shop and tool shop within 100 miles. Offer to run a sample lot for free or at cost to demonstrate turnaround and quality.
- Contact local mold makers and die shops — they have constant demand for D2, H13, and A2 tool steel hardening.
- Reach out to industrial distributors who sell cutting tools and wear components; they often field questions about heat treating sources.
- Attend regional manufacturing meetups or AME chapter events to build referral relationships with procurement managers.
For inbound leads, getting listed on a marketplace like Mercoly puts your shop in front of buyers actively searching for heat treating services — a straightforward way to surface leads without a full sales team.
Pricing Your Services Right
Flat-rate pricing by the pound is common for commodity work ($0.25–$1.50/lb depending on process), but value-based pricing by the piece or by the lot is smarter for specialty work. A rack of precision gears requiring atmosphere carburizing and temper to a tight hardness band is not the same as a batch of mild steel plate. Know your furnace load capacity, cycle time, and gas costs per run — then price to maintain at least 40–50% gross margin.
Operations, Records, and Repeatability
Aerospace and automotive customers will audit your records. Build your documentation habits from day one: batch records, TUS logs, thermocouple calibration records, hardness test results, and customer certifications all need to be traceable and retrievable. Good record-keeping isn't just compliance — it's your proof of quality when a customer calls with a claim.
If you're ready to put your shop in front of buyers who need exactly what you offer, list your services on Mercoly and start generating real leads today.