Product Overview
Product Introduction
Jiangsu Cunrui Metal Products Co., Ltd. offers Inconel 718 (UNS N07718) seamless pipe, a precipitation-hardening nickel-chromium alloy designed for high-strength applications up to 700°C. With its excellent creep resistance, fatigue strength, and oxidation resistance, this alloy is the go-to material for aerospace engines, gas turbines, and deep-well oil extraction equipment.
Unlike solution-strengthened alloys, Inconel 718 gains its strength through controlled precipitation of gamma prime (γ') and gamma double prime (γ'') phases during heat treatment. This unique characteristic gives it a remarkable combination of weldability and high-temperature mechanical performance-something few other nickel alloys can match.
Key Features & Advantages
| Feature | Benefit |
|---|---|
| Precipitation-Hardening Design | Achieves high tensile and yield strength through simple heat treatment; retains strength up to 700°C |
| Excellent Weldability | Resists post-weld cracking-can be welded in any condition without preheating |
| Outstanding Creep Resistance | Maintains dimensional stability and mechanical integrity under long-term high-temperature stress |
| Superior Fatigue Strength | Outperforms most nickel alloys in cyclic loading applications |
| Oxidation & Corrosion Resistance | Performs well in both high-temperature oxidizing and reducing environments |
Chemical Composition (UNS N07718)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Niobium (Nb) + Tantalum (Ta) | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.80 – 3.30 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminum (Al) | 0.20 – 0.80 |
| Cobalt (Co) | 1.0 max |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 0.35 max |
| Silicon (Si) | 0.35 max |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.015 max |
| Boron (B) |
0.006 max |
Mechanical Properties – Standard Heat Treatment Condition
Solution Treated + Age Hardened
| Property | Value |
|---|---|
| Tensile Strength (Rm) | ≥ 965 MPa (140 ksi) |
| Yield Strength (0.2% Offset) | ≥ 790 MPa (115 ksi) |
| Elongation | ≥ 12% |
| Hardness | ≤ 40 HRC |
| Creep Rupture (650°C/1000h) | ≥ 140 MPa |
Available Specifications & Dimensions
| Parameter | Range |
|---|---|
| Standards | ASTM B167, ASME SB167, ASTM B829, AMS 5590, AMS 5589 |
| Outer Diameter | 10 mm – 530 mm (custom sizes available) |
| Wall Thickness | 1.0 mm – 60 mm |
| Length | Up to 50 meters continuous, or cut-to-length |
| Surface Finish | Bright annealed, pickled, polished, or as-rolled |
Key Applications
- Aerospace: Engine discs, turbine blades, compressor casings, shafts, fasteners
- Oil & Gas: Downhole equipment, wellhead components, offshore platforms, sour gas service
- Power Generation: Gas turbine components, nuclear reactor internals, steam generators
- Industrial: High-temperature fasteners, springs, seals, pressure vessels
About Jiangsu Cunrui Metal Products Co., Ltd.
Our Company & Facility
Jiangsu Cunrui Metal Products Co., Ltd. is a specialized supplier of nickel-based alloys and high-performance metal products. Our modern facility is equipped with advanced production lines capable of delivering seamless pipes in complex dimensions with consistent metallurgical quality. We serve clients across the aerospace, oil & gas, power generation, and chemical processing sectors.
Why Work with Us:
Factory-Direct Pricing
We supply from our own production lines, eliminating middleman costs while maintaining strict quality control.
01
Quality Assurance
Every order is backed by in-house testing including chemical analysis, tensile and hardness testing, PMI verification, dimensional inspection, and optional NDT.
02
Comprehensive Certifications
We hold ISO 9001 certification and our products comply with ASTM, ASME, AMS, and API standards.
03
Full Traceability
From melt to finished pipe, all records are maintained for complete material history.
04
Third-Party Support
We welcome inspections by third-party bodies (SGS, BV, TUV, etc.). We can also assist with logistics planning including tariff-sensitive shipping routes when applicable.
05
Frequently Asked Questions
Q: What makes Inconel 718 different from other nickel alloys?
A: Unlike solid-solution strengthened alloys like Inconel 600 or 625, Inconel 718 is precipitation-hardened, which gives it significantly higher yield and tensile strength at elevated temperatures-up to 700°C-while maintaining good weldability.
Q: Can Inconel 718 be welded without special precautions?
A: Yes. One of the key advantages of Inconel 718 is its excellent weldability. Unlike many precipitation-hardening alloys, it is resistant to post-weld cracking and can be welded in any condition without preheating.
Q: Do you offer custom dimensions outside standard ranges?
A: Yes. We support custom OD, wall thickness, and length requirements. Please provide your specifications and we will confirm feasibility.
