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UNS N06625 is the Unified Numbering System designation for Inconel 625, which is a nickel-based superalloy known for its excellent corrosion resistance, high strength, and good mechanical properties at elevated temperatures. Heat treatment processes for Inconel 625 are commonly used to enhance its properties for specific applications.
The typical Inconel 625 heat treatment includes:
1. Solution Annealing (Stress Relief): This Inconel 625 UNS N06625 heat treatment is carried out at temperatures typically ranging from 980°C (1800°F) to 1095°C (2000°F), followed by rapid quenching. Solution annealing helps to dissolve any precipitates and homogenize the microstructure, restoring the material's mechanical properties and improving its corrosion resistance.
2. Aging (Age Hardening): Inconel 625 can undergo age hardening after solution annealing. This involves holding the material at an elevated temperature, often around 550°C (1020°F), for a specified period of time. This process allows the formation of fine precipitates that contribute to improved strength and hardness.
3. Stress Relief Annealing: Stress relief annealing is performed to reduce residual stresses and improve the UNSN06625 dimensional stability. It is typically conducted at temperatures ranging from 550°C to 760°C (1020°F to 1400°F), followed by air cooling.
Core Technical Parameters: ASTM B444 UNS N06625 Requirements
| Property Metric | Grade 1 (Annealed) | Grade 2 (Solution Annealed) |
| Minimum Heat Treatment Temp | 1600°F (871°C) | 2000°F (1093°C) |
| Tensile Strength (Minimum) | 110-120 ksi (758-827 MPa) | 100 ksi (690 MPa) |
| Yield Strength 0.2% Offset | 55-60 ksi (379-414 MPa) | 40 ksi (276 MPa) |
| Elongation in 2 in. (50mm) min | 30% | 30% |
| Primary Industry Focus | Wet Corrosion / High Pressure | High-Temp Creep Resistance |
Quality Validation & Testing After Thermal Treatment
To confirm that the heat treatment phase successfully met technical specifications without prompting unwanted microstructural anomalies, all seamless pipes undergo a rigorous quality validation process:
Mechanical Destructive Testing: Tension testing according to ASTM E8 verifies that yield strength, ultimate tensile strength, and elongation markers match specified Grade 1 or Grade 2 limits.
Hardness Testing: Checked via ASTM E18 protocols to guarantee compliance with standard industrial thresholds.
Non-Destructive Testing (NDT): Hydrostatic or ultrasonic tests verify that the rapid cooling cycle (especially water quenching) did not introduce thermal cracking or micro-fissures into the pipeline walls.
Access Certified Material Documentation for Your Project
At HT Pipeline, we supply premium UNS N06625 cold-worked seamless pipes and tubes fully certified to ASTM B444, ASME SB444, and AMS 5581 specifications. All shipments are accompanied by a complete EN 10204 3.1 Material Test Report (MTR) outlining exact chemical analysis tracking, heat batch details, and verified mechanical properties after heat treatment.
Whether your pipeline design demands the robust corrosion handling of Grade 1 or the high-temperature stability of Grade 2, our technical engineering team can provide itemized quotes, volume pricing tiers, and custom testing integrations.
Contact our sales engineering desk today to submit your specification sheets and receive a complete project consultation.
