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Jiangsu Huaye Technology Co., Ltd.
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Heat Resistant Alloy Manufacturers

In 2016, our company invested in the construction of a VIM (Vacuum Induction Melting) production line for high-temperature alloy master alloys, designed for near-net shape forming, short process flow, and low cost. The line is equipped with vacuum induction furnaces of 500kg, 300kg, and 50kg capacities. Featuring a small-volume melting chamber and a horizontal furnace structure, these furnaces achieve optimal working vacuum control. A three-phase electromagnetic stirring system ensures stable agitation of the molten pool, allowing added elements to dissolve uniformly from top to bottom while maintaining a near-constant melt temperature.
By precisely controlling the pressure and temperature of each melt, we reduce process variability, ensuring a stable distribution of elements and keeping volatile element content within a very narrow range. Additionally, the large melt surface area (bath D/H > 1) provided by the VIM furnace facilitates effective material degassing.
To monitor product quality, we have introduced the SPECTROMAXx direct-reading spectrometer from Germany, enabling online analysis of alloy composition, as well as monitoring of harmful elements and nitrogen content to ensure the quality of our master alloys.
Our company is also equipped with a mechanical properties laboratory, capable of efficiently testing materials for high-temperature stress-rupture properties, high tensile properties, and room-temperature tensile properties.
The entire production system was fully commissioned by March 2017 and has achieved industrial-scale batch production capability. We are certified under the ISO9001 quality management system and have an annual production capacity of approximately 5,000 tons of high-temperature alloy master alloys. All products have been tested by the National Analysis Center for Iron & Steel, with technical specifications meeting the corresponding metallurgical industry standard YB/T 5248-93.
Compared to traditional preparation processes, the high-temperature alloy master alloys produced by our VIM process offer advantages such as high metallurgical quality and low inclusion content.

Grade K417 K418 K419 K438 K444 K452 K4169
Chemical composition
(weight%)		 C 0.13  0.08  0.09  0.10  0.04  0.07  0.02 
0.22  0.16  0.14  0.20  0.08  0.14  0.08 
Cr 8.50  11.50  5.50  15.70  15.40  20.00  17.00 
9.50  13.50  6.50  16.30  16.30  21.80  21.00 
Mn 0.50  0.50  0.50  0.20  0.30  0.30  0.35 
Mo 2.50  3.80  1.70  1.50  1.60  0.30  2.80 
3.50  4.80  2.30  2.00  2.30  0.90  3.30 
Mb 一 1.80  2.50  0.60  0.10  0.15  4.40 
2.50  3.30  1.10  0.30  0.35  5.40 
Ta 一 一 一 1.50  一 一 0.10 
2.00 
Ni 56.78  69.44  55.76  58.19  54.60  52.70  50.00 
64.92  76.75  63.43  63.94  60.90  60.90  55.00 
Co 14.00  11.00  8.00  10.00  10.30  1.00 
16.00  13.00  9.00  11.00  12.00 
Ti 4.50  0.50  1.00  3.00  4.20  3.10  0.65 
5.00  1.00  1.50  3.50  5.00  3.90  1.15 
V 0.60  一 0.10  一 一 一 一
0.90 
W 一 一 9.50  2.40  4.70  3.00  一
10.50  2.80  5.90  4.00 
Zr 0.05  0.06  0.03  0.05  一 一 0.05 
0.09  0.15  0.08  0.15 
Fe 1.00  1.00  0.50  0.50  0.50  0.50  11.57 
24.83 
Al 4.80  5.50  5.20  3.20  2.80  2.10  0.30 
5.70  6.40  5.70  3.70  3.20  2.90  0.70 
Others 一 一 Cu0.40 一 Hf0.20-0.40 B0.01-0.02 Cu0.30
B0.06-0.10 Zr0.02-0.06
Mechanical properties of alloy materials Temperature(°C) 750  800  950  800  900  一 Room temperature
Tensile Strength(σb/
Mpa)		 686  755  700  836  一 一 965 
Durability Performance(σ/
Mpa)		 一 490  一 365  274  一 550 
Elongation(δ
1%)		 2.5  4  6  16.6  一 一 30 
Grade GH2132 GH3039 GH3044 GH3128 GH4133 GH4169 GH4220 GH4708
Chemical Composition
(weight%)		 C 0.08  0.08  0.10  0.05  0.07  0.08  0.08  0.05 
0.10 
Cr 13.50  19.00  23.50  19.00  19.00  17.00  9.00  17.50 
16.00  22.00  26.50  22.00  22.00  21.00  12.00  20.00 
Ni 24.00  69.42  50.20  56.59  70.22  50.00  46.41  58.12 
27.00  77.60  63.20  65.20  76.65  55.00  60.65  70.05 
Co 一 一 一 一 一 1.00  14.00  0.05 
15.50 
W 一 一 13.00  7.50  一 一 5.00  5.50 
16.00  9.00  6.50  7.50 
Mo 1.00  1.80  1.50  7.50  一 2.80  5.00  4.50 
1.50  2.30  9.00  3.30  7.00  6.00 
Al 0.40  0.35  0.50  0.40  0.70  0.30  3.90  1.90 
0.75  0.80  1.20  0.70  4.80  2.30 
Ti 1.75  0.35  0.30  0.40  2.50  0.75  2.20  1.00 
2.30  0.75  0.70  0.80  3.00  1.15  2.90  1.40 
Fe 50.17  3.00  4.00  0.20  1.50  11.92  3.00  4.00 
58.65  24.40 
Nb 一 0.90  一 一 1.15  4.75  一 一
1.30  1.65  5.50 
V 0.10  一 一 一 一 一 0.25  一
0.50  0.80 
B 0.00  一 一 0.01  一 0.01  一 0.01 
0.01 
Zr 一 0.06  一 一 一
Ce 一 一 一 一 0.01  一 一 0.03 
Mn 一 一 0.50  0.50  0.35  0.35  0.50  0.50 
Mechanical properties of alloy materials Temperature(°C) Room temperature Room temperature 一 一 Room temperature 650  一 一
Tensile Strength(σb/
Mpa)		 930  635  一 一 750  1000  一 一
Yield Strength(δs/
Mpa)		 590  一 一 一 1080  一 一 一
Elongation(δ
1%)		 15  3  一 一 16  15  一 一
Grade C Cr Mn Mo Nb Ta Ni  Co Ti Hf W Zr Fe Al Others
DD406 0.001
0.04		 3.80
4.80		 0.15  1.50
2.50		 1.20  6.00
8.50		 54.70
66.34		 8.50
9.50		 0.10  0.05
0.15		 7.00
9.00		 0.10  0.30  5.20
6.20		 Re1.6~2.4
DD407 0.007  7.80
8.30		 0.01  2.10
2.40		 0.15  3.30
3.70		 65.7
69.4		 5.00
6.00		 1.80
2.20		 0.0075  4.80
5.20		 0.0075  0.20  5.80
6.10		 -
DD408 0.03  15.50
16.50		 0.15  一 一 0.70
1.20		 49.62
55.50		 8.00
9.00		 3.60
4.20		 一 5.60
6.40		 0.007  0.50  3.60
4.20		 Al+Ti
7.5~7.9
Grade C   Cr Mn Mo Nb Ta   Ni Co Ti V W Zr Fe Al Others
DZ404 0.10
0.16		  9.00
 10.00		 0.50  3.50
4.20		 - - 62.16
69.58		 5.50
6.50		 1.60
2.20		 - 5.10
5.80		 0.02  1.00  5.60
6.40		 -
DZ405 0.07
0.15		 9.50
11.00		 0.50  3.50
4.20		 一 一 58.5
65.92		 9.50
10.50		 2.00
3.00		 一 4.50
5.50		 0.10  一 5.00
6.00		 -
DZ408 0.07
0.10		  8.00
 8.70		 0.10  0.40
0.60		 0.10  2.80
3.30		 59.03
63.27		 9.00
10.00		 0.60
0.90		 0.10  9.30
9.70		 0.005
0.02		 0.20  5.25
5.75		 Hf1.30~1.70
Re0.10
DZ411 0.07
0.12		 13.50
14.30		 - 1.30
1.70		 一 2.50
3.10		 58.28
62.73		 9.00
10.00		 4.60
5.20		 一 3.50
4.10		 一 一 2.80
3.40		 Al+Ti≥7.80
DZ417G 0.13
0.22		  8.50
 9.50		 0.20  2.50
3.50		 - - 63.53
70.35		 9.00
11.00		 4.10
4.70		 0.60
0.90		 - 一 0.5  4.80
5.70		 -
About Us
Jiangsu Huaye Technology Co., Ltd.
As high temp alloys manufacturers and high melting point alloys factory, Jiangsu Huaye Technology Co., Ltd. is located in the Industrial Park, Dongxing Town, Jingjiang City, Jiangsu Province, with a registered capital of 34.917 million RMB.
We are a high-tech enterprise specializing in the production of high-temperature alloys, high-temperature wear-resistant alloys, high-temperature heat-resistant alloys, high-temperature corrosion-resistant alloys and related products, as well as energy-saving industrial furnaces. Our main product lines include superalloy castings, high-temperature alloy forgings, three-roll six-arm assemblies, radiant tubes, energy-saving furnace rollers, material baskets and trays, shaft sleeves, support arms, and various other series. These products are widely used in industries such as aerospace, marine, petrochemicals, thermal power, metallurgy, and strip steel processing.
The company operates under a comprehensive quality assurance system and has passed the ISO9001 quality system certification, ensuring process control and quality consistency at every workstation throughout each stage of production. Through continuous dedication, our company has established itself as a trusted and recognized enterprise in the supply of supporting equipment and spare parts for the hot-dip galvanizing, aluminizing, and aluminum-zinc-silicon strip coating industries.
Covering an area of nearly 20,000 square meters, the company houses four workshops—dedicated to casting, metalworking, welding, and sand mold production—as well as a corporate testing center. We have successively acquired over 100 units of R&D and testing equipment, including vacuum furnaces, medium frequency furnaces, electroslag furnaces, centrifuges, spectrometers, and electronic universal testing machines. We have established production lines for investment casting with silica sol, sand casting, and centrifugal casting, along with a material performance testing laboratory. This enables us to provide comprehensive, high-quality services covering the entire process from material R&D to finished casting delivery and after-sales support, with an annual production capacity of 10,000 tons of alloy castings.
The company is committed to technological innovation. Recognized as a National Sci-Tech SME and a Taizhou City Patent Standard Integration Innovation Demonstration Enterprise, we invest over 4% of our annual sales revenue in R&D, ensuring the continuous development and output of new material products. In recent years, the company has obtained 27 authorized patents, including 14 invention patents.
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In extremely harsh industrial environments, material stability directly determines the service life and safety of critical equipment. Leveraging its four major production workshops—covering casting, metalworking, welding, and sand mold manufacturing—Jiangsu Huaye Technology Co., Ltd. specializes in the field of special alloys, dedicated to providing high-performance metal material solutions to industries worldwide.


Expertise in High-Temperature and Heat-Resistant Alloys

1. Core Definition of High-Temperature Alloys

High-temperature alloys are a class of metal materials based on iron, nickel, or cobalt matrices, capable of operating continuously under high temperatures (exceeding 600°C) and specific stress loads. These materials maintain excellent oxidation resistance, corrosion resistance, and high mechanical strength even at extremely elevated temperatures. The stability of their microstructure is the primary metric for assessing their quality; this stability is typically ensured through precision casting and heat treatment processes designed to eliminate grain boundary defects.

2. Performance Advantages of High-Temperature Alloys

High-temperature alloys are widely utilized in the aviation, aerospace, and heavy industries. Their key advantages include: **Microstructural Stability:** The internal metal structure undergoes no phase transitions amidst drastic temperature fluctuations, thereby preventing deformation. **Creep Resistance:** Under constant high-temperature stress, the material demonstrates exceptional resistance to plastic deformation. **Thermal Fatigue Resistance:** The ability to withstand repeated cycles of thermal shock without developing cracks.

3. Classification Characteristics of Heat-Resistant Alloys

Heat-resistant alloys require not only high-temperature strength but also, and more importantly, the ability to resist degradation within high-temperature oxidizing atmospheres. **Oxidation Resistance:** Achieved through the formation of a dense oxide film on the surface, which acts as a barrier to prevent further erosion by external media. **Sulfidation and Carburization Resistance:** In complex chemical reaction environments, heat-resistant alloys effectively resist the penetration of harmful gases, thereby maintaining the chemical purity of the material.

4. Application Rationale for High-Melting-Point Alloys

High-melting-point alloys are typically composed of refractory metals such as tungsten, molybdenum, niobium, and tantalum. The melting points of these materials are significantly higher than those of standard steels. Through the integration of sand mold manufacturing and precision metalworking—and by carefully accounting for the processing characteristics of these high-melting-point materials—Jiangsu Huaye Technology Co., Ltd. ensures that its products retain reliable structural integrity even in extreme environments where temperatures approach the material's melting point.


Comparison Table: Industrial Applications vs. Material Characteristics

Alloy Category Core Elemental Base Primary Physical Characteristics Industrial Value Manifestation
High Temperature Alloy Nickel-base / Cobalt-base Superior instantaneous high-temperature strength Critical thermal energy conversion components
High Temp Alloys Multi-component solid solution strengthening Long-term operational creep resistance Industrial power and propulsion systems
Heat Resistant Alloy Chromium, Silicon, Aluminum elements Excellent high-temperature oxidation resistance Industrial furnaces and heat treatment equipment
High Melting Point Alloys Refractory metal elements Extremely high melting threshold Ultra-high temperature structural members


Frequently Asked Questions (FAQ)

Q1: Why must high-temperature alloys undergo precision machining in specialized workshops?
Due to the high hardness and low thermal conductivity of high-temperature alloys, traditional machining processes can easily lead to tool wear and surface hardening of the material. Through its specialized metalworking workshops and metallographic testing center, Jiangsu Huaye Technology Co., Ltd is able to precisely control the material's physical state during processing, thereby preventing stress concentration.


Q2: What is the principle behind the oxidation resistance of heat-resistant alloys?
Heat-resistant alloys achieve oxidation resistance by incorporating specific alloying elements that react with oxygen at high temperatures to form a continuous and dense oxide film. This film bonds firmly to the base metal, effectively preventing the inward diffusion of oxygen atoms and thereby extending the material's service life.


Q3: What are the challenges involved in casting high-melting-point alloys?
The primary challenge in processing high-melting-point alloys lies in their extremely high melting temperatures, which impose rigorous demands on sand molds and casting dies. Advanced sand-molding techniques and precise cooling control systems are essential to ensure the density and dimensional accuracy of the castings, preventing the formation of shrinkage cavities or cracks.


Q4: How is the service life of high-temperature alloys evaluated?
Evaluation is primarily based on creep-rupture strength tests and high-cycle fatigue tests. At our corporate testing center, we simulate the high-temperature and stress conditions encountered in actual service environments to monitor the material's time-to-fracture and deformation levels, thereby providing a scientific basis for engineering applications.


Q5: How does Jiangsu Huaye Technology Co., Ltd ensure material purity during production?
Through the use of vacuum melting equipment in our casting workshops—supported by our accompanying testing center—we strictly control the content of impurity elements such as sulfur and phosphorus. A high-purity matrix is ​​the fundamental prerequisite for high-temperature alloys to exhibit their superior physical properties.


About Jiangsu Huaye Technology Co., Ltd

Jiangsu Huaye Technology Co., Ltd is situated within a modern industrial park. Our expansive facility encompasses the entire industrial chain, ranging from raw material preparation to finished product inspection.

Casting Workshop: Dedicated to the melting and forming of high-temperature alloys and heat-resistant materials, ensuring the purity of the molten metal. Sand Molding: Provides high-precision mold support for castings made from high-temperature alloys with complex geometries.

Machining and Welding Workshop: Employs specialized processes to overcome the challenges of forming high-hardness materials, ensuring that the strength of welded joints matches that of the base material.

Testing Center: Conducts in-depth analysis of the chemical composition and physical properties of every material batch, ensuring full compliance with global industrial standards.

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