Heat Treatment Services
At Rapid Protos, we provide professional heat treatment services to enhance the mechanical and physical properties of custom parts. With advanced heat treatment equipment and an experienced engineering team, we offer precise, reliable, and cost-effective solutions for a wide range of metals and alloys. Whether you need improved hardness, wear resistance, or dimensional stability, our heat treatment process ensures your parts meet the highest performance standards.
What is Heat Treatment?
Heat treatment is a controlled heating and cooling process applied to metals to alter their physical and mechanical properties without changing their shape. This process can improve hardness, strength, ductility, and wear resistance, depending on the material and application requirements. Common heat treatment techniques include annealing, quenching, tempering, carburizing, nitriding, and case hardening.
Why Perform Heat Treatment?
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Increase hardness for better wear resistance
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Improve strength to handle higher loads and stress
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Enhance toughness for improved impact resistance
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Relieve internal stress to prevent deformation during machining or usage
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Improve fatigue resistance for longer service life
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Achieve desired surface characteristics for specific applications
Heat Treatment Parameters
| Parameter | Options / Description |
|---|---|
| Color | Silver, Grey, Black, Dark Brown (depends on process) |
| Gloss | Matte, Semi-gloss, Glossy |
| Coating Thickness | 0.01–1 mm (depending on case depth) |
| Surface Roughness | Ra 0.8–3.2 μm (after treatment, before polishing) |
| Surface Hardness | Up to HRC 65 (varies by material and process) |
| Wear resistance | High to very high |
| Dimensional Changes | ±0.05–0.2 mm (depends on material and heat cycle) |
| Part Masking | Available for areas that should not be treated |
| Availability | Suitable for small to large parts |
| Visual Appearance | Uniform surface, minimal discoloration |
What is Electroplating Surface Treatment ?
Before:
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Lower hardness and wear resistance
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Less uniform surface appearance
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Higher risk of deformation under stress
After:
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Increased hardness and strength
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Enhanced surface durability
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Improved dimensional stability
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Longer part lifespan
Materials Suitable for Heat Treatment
| Material Type | Common Grades / Types |
|---|---|
| Carbon steel | 1045, 1050, 1060, 1080, etc. |
| Alloy steel | 4140, 4340, 6150, etc. |
| Tool steel | D2, H13, O1, M2, etc. |
| Stainless Steel | 410, 420, 440C, 17-4PH, etc. |
| Titanium | Grade 5 (Ti-6Al-4V), Grade 23 |
| Copper Alloys | Beryllium copper, bronze (special treatments) |
What Hardness can Heat Treatment Achieve?
| Material Category | Material Grade | Heat Treatment Process | Hardness Range (HRC) | Hardness Range (HB) |
|---|---|---|---|---|
| Carbon Steel | 45# (C45) | Quenching + Tempering | 50–55 HRC | 515–570 HB |
| Alloy Structural Steel | 40Cr | Quenching + Tempering | 28–32 HRC | 285–310 HB |
| 40Cr | Induction Hardening | 50–58 HRC | 510–590 HB | |
| 42CrMo | Quenching + Tempering | 28–36 HRC | 285–340 HB | |
| 42CrMo | Surface Hardening | 50–55 HRC | 515–570 HB | |
| Tool Steel | Cr12MoV | Quenching + Tempering | 58–62 HRC | 650–710 HB |
| SKD11 | Quenching + Low-Temperature Tempering | 60–62 HRC | 670–710 HB | |
| SKH51 (High-Speed Steel) | Quenching + Tempering | 63–66 HRC | 710–760 HB | |
| Stainless Steel | 420 | Quenching + Tempering | 48–52 HRC | 490–530 HB |
| 440C | Quenching + Tempering | 56–60 HRC | 600–670 HB | |
| Aluminum Alloy | 6061-T6 | Solution Heat Treatment + Artificial Aging | — | 95 HB |
| Column 1 Value 12 | 7075-T6 | Solution Heat Treatment + Artificial Aging | — | 150 HB |
| Titanium Alloy | TC4 (Ti-6Al-4V) | Solution Heat Treatment + Aging | 36–41 HRC | 350–410 HB |
Notes:
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HRC refers to Rockwell hardness (C scale), suitable for high-hardness metals, while HB refers to Brinell hardness.
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Aluminum alloys and some titanium alloys are generally measured in HB.
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The hardness values are typical reference values; actual results depend on heat treatment parameters such as temperature, holding time, and cooling method.
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This table is intended for material selection and process reference.
Description of Hardened Layer Depth:
- Surface quenching (high-frequency, flame): The hardened layer is usually 1–6mm, suitable for parts that require high surface wear resistance but maintain core toughness.
- Carburizing and quenching: The hardened layer is thin (0.8–1.5mm) and extremely hard (HRC 58–62), commonly used for gears, bearings, etc.
- Nitriding treatment: The hardened layer is very thin (0.2–0.6mm), with an ultra-hard surface (900–1200 HV), featuring good wear resistance and corrosion resistance, and no deformation.
- Full quenching: The entire cross-section is hardened, and the depth depends on the hardenability of the material and the cross-sectional thickness of the workpiece.
Applications of Heat-Treated Parts
Heat treatment is widely used in industries that require high-performance, wear-resistant, and dimensionally stable parts.
Industries & Components:
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Automotive: Gears, shafts, crankshafts, camshafts, axles
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Aerospace: Landing gear components, turbine blades, structural fasteners
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Industrial Equipment: Bearings, machine tool components, hydraulic parts
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Oil & Gas: Drill bits, valve seats, pump shafts
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Medical Devices: Surgical tools, orthopedic implants
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Robotics: Precision drive components, end-effectors
Heat-Treated Part Case Studies
