Guoyin Metal Material (Wuxi) Co., Ltd.

ABOUT US


Hebei Chengyu Metal Materials Co., Ltd. (referred to as "Chengyu Metal") is an international and professional supplier of steel and non-ferrous metal raw materials, committed to providing the most reliable and customized steel and metal solutions for global users. After more than ten years of hard work, the company has adapted to the growing needs of the international market and started to serve global users. As a one-stop supplier of steel and metal raw materials, it has become the preferred steel supplier for tens of thousands of customers around the world with its strong supply chain, solid professional knowledge and reliable services. Customers are spread across more than 110 countries and regions such as Europe, the Middle East, South America, and Southeast Asia. The company has successively invested in the construction of stainless steel, galvanized steel, color-coated steel, seamless steel pipes, cold-rolled plates, and stainless steel product production lines in China; at the same time, it has established long-term friendly cooperative relations with major domestic and foreign steel mills such as Baosteel, TISCO, and Posco, providing customers with high-quality products and services conveniently and quickly. Chengyu Metal adheres to the business philosophy of integrity, professionalism, and innovation, and is committed to providing customers with high-quality products and services. The company has a high-quality and professional team, who rely on their rich industry experience and superb technical level to continuously promote the company's technological innovation and product upgrades.

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20 year

Experience

150 +

Active Employees

50000

Floor Area

50 +

Cooperative Partner

PRODUCT CENTER

It currently has become the preferred steel supplier of tens of thousands of customers around the world with its strong supply chains, solid professional knowledge and reliable service. Customers are located in Europe, the Middle East, South America, Southeast Asia and more than 110 countries and regions.

A588 Carbon Steel Plate

ASTM A588 steel includes Class A, Class B, Class C, and Class K. The ASTM A588 steel specification is based on the standard specification for high-strength low-alloy structural steel with a lower yield point of up to 50ksi for applications requiring high strength and corrosion resistance.

A36/Q235/S235JR Carbon Steel Coil

A36 is a low-carbon steel containing trace amounts of manganese, phosphorus, sulfur, silicon and other elements such as copper. A36 has good weldability and high yield strength, and is the structural steel plate specified by the engineer. ASTM A36 steel plate is often manufactured into a variety of structural steel parts. This grade is used for welded, bolted or riveted construction of bridges and buildings, as well as for general structural purposes. Due to its yield point, A36 carbon plate can be used to design lighter-weight structures and equipment, and provide good weldability. Construction, energy, heavy equipment, transportation, infrastructure and mining are the industries where A36 panels are commonly used.

A179 Seamless Steel Tube

A179 seamless cold drawn low carbon steel pipe is equivalent to China's No. 10 high-quality low-carbon steel. A179 is suitable for cold-drawn high-quality low-carbon seamless steel pipes for heat exchangers and condensers.

A36 Carbon Steel Bar

A36 is a low-carbon steel containing trace amounts of manganese, phosphorus, sulfur, silicon and other elements such as copper. A36 has good weldability and high yield strength, and is the most specified structural steel plate by engineers. ASTM A36 is most commonly manufactured as a variety of structural steel parts. This grade is used for welded, bolted or riveted construction of bridges and buildings, as well as for general structural purposes. Due to its lowest yield point, A36 can be used to design lighter-weight structures and equipment, and provide good weldability.

304 Stainless Steel Plate

304 stainless steel is a kind of universal stainless steel material, rust resistance than 200 series of stainless steel material is stronger. High temperature resistance is also better, can be as high as 1000-1200 degrees. 304 stainless steel has excellent corrosion resistance and good intergranular corrosion resistance. For oxidizing acids, it is concluded in the experiment that 304 stainless steel has strong corrosion resistance in nitric acid with a concentration of less than or equal to 65% of the boiling temperature. It also has good corrosion resistance to alkali solution and most organic and inorganic acids.

202 Stainless Steel Coil

202 stainless steel is an austenitic chromium-nickel-manganese alloy. It has high ductility, good corrosion resistance and excellent toughness in both high and low temperature environments. 202 stainless steel is one of the most widely used 200 series stainless steel. 202 stainless steel, the austenitic structure is stabilized by the addition of nickel and manganese, thereby preventing the formation of harmful phases, such as sigma phase or chromium carbide. The high nickel content also improves the corrosion and oxidation resistance of the steel at high temperatures.

B500A/B500B/B500C Rebar

The differences between the, B and C designations are complex and related to structural tolerances. For steel mesh products, B500A grade steel is usually used, and for steel bars, B500B grade steel is used. B500C steel is rarely required, and it is always worthwhile for structural engineers to check whether B500B grade steel can be used instead of B500C, because B500C usually has a significant cost overhead.

Carbon Steel H Steel

H-beam is a new type of steel for economic construction. H-beam has economical and reasonable cross-sectional shape, good mechanical properties, uniform extension of each point on the cross-section and small internal stress during rolling. Compared with ordinary I-beam, H-beam has the advantages of large cross-sectional modulus, light weight and metal saving, which can reduce the building structure by 30-40%. In addition, because its legs are parallel to the inner and outer sides and the leg ends are right angles, the welding and riveting work can be saved by 25%. It is often used in large buildings (such as factories, high-rise buildings, etc.) with large bearing capacity and good cross-sectional stability, as well as bridges, ships, lifting and transportation machinery, equipment foundations, supports, foundation piles, etc.

Galvanized Corrugated Roof Sheet

Galvanized roof shingles are made of galvanized steel sheet used for roofing and coated with zinc. The zinc coating provides moisture and oxygen protection for the base steel. According to the galvanizing process, it can be divided into hot-dip galvanized steel plate and electro-galvanized steel plate. The corrugated design will improve its strength and enable it to withstand harsh weather conditions. Common designs include wavy, trapezoidal designs, ribbed galvanized roof panels, etc. It can be used as a single-layer board, covering an existing roof, or a steel sandwich panel.

A572/S355JR Carbon Steel Bar

A572 steel bars are lightweight, but have good strength, ductility and workability, making them ideal for structural applications. These characteristics make the A572 relatively simple to shape into different structures, while maintaining the ability to withstand large stresses and loads.

OUR ADVANTAGE

It has established long-term and friendly relations with Baosteel, Tisco, Posco and other major domestic and international steel mills to conveniently and efficiently provide customers with high-quality products and services.

QUALITY ASSURANCE

QUALITY ASSURANCE

We have carried out strict inspection of every part and product, trying to have no quality problems in the hands of customers.

GOOD SERVICE

GOOD SERVICE

Answer the customer's question within8 hours, and the service engineer will be on standby 24 hours a day.

PRICE ADVANTAGE

PRICE ADVANTAGE

Factory direct sales, no middlemen price difference.Advanced production equipment and manufacturing technology

RICH EXPERIENCE

RICH EXPERIENCE

The products are sold to more than 20 provinces, cities and autonomous regions in China and exported to dozens of countries in Africa and Southeast Asia.

FACTORY WORKSHOP

The company has successively invested and built production lines of stainless steel, galvanized steel, color coating steel, seamless steel pipe, cold-rolled sheet and stainless steel products in China;


Factory Workshop

Factory Workshop


Factory Workshop

Factory Workshop


Factory Workshop

Factory Workshop


Factory Workshop

Factory Workshop


Factory Workshop

Factory Workshop


Factory Workshop

Factory Workshop

NEWS CENTER

The company has successively invested and built production lines of stainless steel, galvanized steel, color coating steel, seamless steel pipe, cold-rolled sheet and stainless steel products in China;

The method of using magnets to detect stainless steel has great limitations

1. The magnetism of stainless steel is directly related to its metallographic structure ‌Austenitic stainless steel (such as 304, 316)‌ Theoretically, it is non-magnetic, but in actual production, it may produce weak magnetism due to cold processing (such as stamping, bending) or composition deviation. For example, 304 stainless steel may be magnetic after processing due to the partial conversion of austenite to martensite, but this does not affect its corrosion resistance. Martensitic/ferritic stainless steel (such as 430, 420)‌ It is magnetic in itself and is often used for knives, fasteners, etc., but this type of material still belongs to the category of stainless steel. For example, a 430 stainless steel frying pan can be adsorbed by a magnet, but it is indeed a qualified stainless steel product. 2. Three major misunderstandings of magnet detection ‌False negative risk‌ Non-stainless steel materials such as zinc alloys and copper alloys are also non-magnetic and can be easily misjudged as "high-quality stainless steel". False positive risk‌ Some inferior "stainless iron" (recycled steel demagnetization treatment) may be non-magnetic, but the anti-rust performance is extremely poor. Ignore performance differences ‌ Corrosion resistance (such as 316>304>430) has no direct correlation with magnetism. Austenitic stainless steel is still better than magnetic ferritic stainless steel even with weak magnetism. 3. More scientific identification method ‌Professional testing ‌ Analyze the chromium and nickel content through a spectrometer (304 needs to contain 18% chromium and 8% nickel). Observe the mark ‌ Regular products will be marked with the material (such as SUS304), avoid buying unmarked products. Corrosion test ‌ Observe the rust condition by salt spray test or soaking in acidic solution (such as lemon juice).

Apr 25,2025

About stainless steel forging

1 Preparation before forging (1) Billet selection Select appropriate billets according to the final product shape and performance requirements of stainless steel. Billets can be bars, plates or ingots. For parts with complex shapes, ingots may need to be selected for forging to ensure the uniformity of the material. At the same time, the size of the billet should be considered, and sufficient processing allowance should be left. The allowance generally ranges from a few millimeters to more than ten millimeters, depending on the size and precision requirements of the parts. (2) Heating equipment Stainless steel forging requires appropriate heating equipment. Commonly used ones are resistance furnaces and gas furnaces. Resistance furnaces have accurate heating temperature control and high thermal efficiency, which can make the stainless steel billet heated evenly. Gas furnaces have fast heating speed, but the temperature control is relatively complicated. Control of heating temperature is crucial for stainless steel forging, because different types of stainless steel have different starting and ending forging temperature ranges. For example, the starting forging temperature of austenitic stainless steel is generally around 1150-1200℃, and the ending forging temperature is not less than 900℃. 2 Forging process (1) Forging methods It includes free forging and die forging. Free forging is highly flexible and is suitable for small-batch production of single pieces or large parts with simple shapes. Forging workers gradually shape the blank by operating forging tools such as air hammers and steam-air hammers. Die forging uses a die to shape the blank, which has high production efficiency and is suitable for mass production of parts with complex shapes and high dimensional accuracy requirements. For example, stainless steel connecting rods for automobile engines are usually produced by die forging. (2) Selection of forging ratio The forging ratio is an indicator of the degr

Apr 25,2025

Common specifications of PPGI

Parameter Range Typical value Substrate thickness 0.3~1.2mm 0.5mm Alu-zinc coating weight 60~150g/m² (double-sided) 90g/m² Coating total thickness 20~35μm (double-sided) 25μm Board width 600~1250mm 1000mm Roll weight 3~10 tons 5 tons 2. Application areas Architecture: roofs, walls, curtain walls (such as airports and gymnasiums). Home appliances: refrigerator panels, air conditioner shells, oven liner. Transportation: compartment partitions, container shells. Furniture: office partitions, cabinet door panels. 3. Differences from PPGI and PPGL Type Substrate Features Main uses PPGI Galvanized sheet (GI) Low cost, weak corrosion resistance Ordinary buildings, home appliances PPGL Alu-zinc (GL) Excellent corrosion resistance/heat resistance, long life High-end buildings, industrial environments PPAL Aluminum-coated sheet (AL) High temperature resistance (up to 650°C), good reflectivity Chimneys, ovens 4. Purchase considerations Coating type: PVDF for outdoor use, polyester for indoor use. Coating weight: ≥90g/m² is recommended for coastal/industrial areas. Environmental protection standards: Confirm that there is no chromium treatment (RoHS compliant). Surface texture: Embossing, matte and other processes affect the appearance and stain resistance. PPGI has dual protection through substrate + coating, combining functionality and aesthetics, and is an ideal material to replace traditional spraying

Apr 18,2025

PPGI steel (aluminum-zinc coated steel sheet)

PPGI (Pre-Painted Galvalume Steel Coil/Sheet) is a pre-painted aluminum-zinc coated steel sheet, which combines the corrosion resistance of the aluminum-zinc coated substrate and the decorative/protective performance of the color coating. It is widely used in construction, home appliances and other fields. The following are its key knowledge points: 1. Substrate material: Galvalume (aluminum-zinc coated) PPGI's metal substrate is aluminum-zinc coated steel sheet (55% aluminum, 43.4% zinc, 1.6% silicon), and its performance is better than ordinary galvanized sheet (GI): Corrosion resistance: The corrosion resistance of aluminum-zinc coated steel is 2 to 6 times that of galvanized sheet (especially in high temperature and high humidity environments). Heat resistance: It can withstand high temperatures of 300°C for a long time (galvanized sheet is only about 200°C). Reflectivity: The aluminum layer reflects ultraviolet rays and delays the aging of the coating. 2. Coating structure (five-layer composite) Primer (epoxy resin/polyester) 5~10μm Topcoat (PVDF/polyester/SMP) 15~25μm Chemical conversion layer (chromate/chrome-free) 0.1~0.5μm Alu-zinc coating (Galvalume) 20~150g/m² Rolled steel substrate 0.3~1.2mm Coating type comparison: PVDF (fluorocarbon): super weather-resistant (more than 20 years), UV-resistant, used for high-end building curtain walls. Polyester (PE): low cost, rich colors, suitable for home appliances and interior decoration. SMP (silicon-modified polyester): weather resistance is between PVDF and PE. 3. Core performance indicators Corrosion resistance: Salt spray test (alu-zinc coating substrate): ≥1000 hours (red rust appearance time). The scratch expansion width of the color-coated plate is ≤2mm (ASTM D1654). Adhesion: Cross-hatch test level 0 (no peeling). Hardness: Pencil hardness ≥ H (PVDF coating can reach 2H). Temperature resistance: -40°C~120°C without cracking.

Apr 18,2025

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