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13 Facts about SPA-H Steel


SPA-H is a Japanese grade weathering steel. The deviation of its chemical composition, mechanical properties, thickness and width requires the implementation of the Japanese standard JIS G3125 "High Weather Resistance Rolled Steel". It is equivalent to Q345GNHL (09CuPCrNiA) in GB/T 4171, and is mostly used for container steel plates.

1. Introduction of SPA-H steel

Weathering steel, that is, atmospheric corrosion-resistant steel, is a low-alloy steel series between ordinary steel and stainless steel. Weathering steel is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. Extension, forming, welding and cutting, abrasion, high temperature, fatigue resistance and other characteristics; At the same time, it has the characteristics of rust resistance, corrosion resistance and longevity of components, thinning and consumption reduction, labor saving and energy saving.

SPA-H is a kind of weathering steel. The steel grade adopts Japanese steel grade SPA-H. The deviation of its chemical composition, mechanical properties, thickness and width requires the implementation of Japanese standard JISG3125-2004 "High Weather Resistance Rolled Steel".

2. Chemical composition of weathering steel SPA-H steel


3. Mechanical properties of weathering steel SPA-H steel

Yield strength: ≥355MPa Tensile strength: ≥490MPa Elongation: ≥15

4. The production process of SPA-H steel

First, the hot-rolled strip is passed through the pickling unit to generate the chilled strip, and the chilled strip is then passed through the continuous annealing unit to generate the final cold-rolled product. Cold rolling successfully produced cold rolled SPA-H products. The product has the characteristics of high strength and good extension. The container made of this product can fully meet the requirements of users and can replace the hot-rolled coil of the same variety.

5. Characteristics of weathering steel SPA-H steel

Weathering steel SPA-H steel has good atmospheric corrosion resistance, and also has the characteristics of high temperature, abrasion, forming, fatigue, toughness, plastic extension, etc. It can be used bare, thinned or simplified for painting. SPA-H is rust-resistant, which can reduce the thickness and consumption of components, resist atmospheric corrosion and prolong life. It has the characteristics of saving labor and energy, benefiting component manufacturers and users.

6. The main application of SPA-H steel

Weathering steel is mainly used for steel structures that are exposed to the atmosphere for a long time, such as railways, vehicles, bridges, towers, photovoltaics, and high-speed projects. It is used to manufacture structural parts such as containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and containers containing hydrogen sulfide corrosive medium in chemical and petroleum equipment. Now SPA-H weathering steel is more and more used in landscape decoration and garden landscape industry, which reflects its wider use.

7. Why is SPA-H steel suitable for containers?

As we pay close attention to issues such as manufacturing cost, mineral resources, and energy, long-life and lightweight containers have become a trend, and there are signs of using aluminum, which is very lightweight, to manufacture containers. The yield strength of the steel plate for containers is about 300MPa. The weathering steel SPA-H is designed with the reasonable composition of Cu, P, Cr, and Ni added to the low-carbon steel. The yield degree is between 390 and 439, and it has strong corrosion resistance. SPA-H can be used to make containers.

In the container manufacturing industry, hot-rolled thin steel plates with a compression resistance of 345MPa or more and atmospheric corrosion resistance are generally used to manufacture internal structures and outer plates. More than 3 million tons of steel plates are used to manufacture containers every year, and with the development of the container transportation industry, the demand for atmospheric corrosion-resistant steel is gradually increasing.

The weathering steel SPA-H not only has excellent corrosion resistance, but also has good dimensional accuracy, plate shape, surface quality and formability, which meets the requirements of container steel.

At present, SPA-H is widely used in the container manufacturing industry. The amount of steel used in the container is relatively large, and the thickness between the commonly used specifications is 1.5MM-2.0MM. The common thickness on the market is between 1.5-16MM.

8. Corrosion resistance principle of weathering steel SPA-H steel

When steel is exposed to sunlight and wind, its corrosion resistance is especially important. After adding phosphorus, copper, chromium, nickel and other trace elements to the steel, a dense and strong protective film will be formed on the surface of the copper material, which can play a certain protective role.

SPA-H is a weathering steel for container processing, cutting and welding. SPA-H is mainly used for ship containers, steel bridges, ships and tanks to prevent atmospheric corrosion.

Over time, the protective layer develops and regenerates in response to pollutants in the atmosphere. The thickness used should be considered, especially when the material is used for structural purposes and not just decorative purposes.

9. The application prospect of SPA-H steel

When the weathering steel of SPA-H is exposed to the air, it will form a dense oxide film on the surface after contact with air and moisture, and the copper, nickel and other elements in it will adhere to the surface, forming a protective barrier against the continuous erosion of the outside world. barrier. The interior can remain in good condition for many years without being damaged. While ordinary steel plates are exposed to the outside world over time, oxidation will continue to erode inside. Therefore, the service life of weathering steel is much higher than that of ordinary steel plates. From the perspective of long-term cost, it is an economical and applicable steel grade, which is worthy of promotion.

10. Supply of weathering steel SPA-H

The domestic steel mills that produce SPA-H weathering steel mainly include Anshan Iron and Steel, Shougang, Nippon Steel, Benxi Iron and Steel, Wuhan Iron and Steel, etc. Its amount is much larger than that of weathering steel of other materials. SPA-H weathering steel is made by adding a small amount of corrosion-resistant elements such as copper and nickel. We can provide spot and futures services, and can be shipped to most countries in the world!

11. Specifications of SPA-H

The spot specification of SPA-H weathering steel plate is (mm):

SPA-H weathering steel plate 2.0×1260×6000

SPA-H weathering steel plate 3.0×1260×6000

SPA-H weathering steel plate 4.0×1260×6000

SPA-H weathering steel plate 5.0×1260×6000

SPA-H weathering steel plate 6.0×1510×6000

SPA-H weathering steel plate 8.0×1510×6000

SPA-H weathering steel plate 10.0×1510×6000

SPA-H weathering steel plate 12.0×1510×6000

SPA-H weathering steel plate 14.0×1510×6000

SPA-H weathering steel plate 16.0×2200×10000


12. Delivery status of weathering steel SPA-H

Steel grade: Weathering steel SPA-H

Thickness: 3mm--150mm support fixed opening

Width: 30mm--4000mm

Length: 1000mm--12000mm, which can be customized according to your actual needs.

Surface treatment: coating, painting, etc. or according to your requirements

Delivery Status: Hot Rolled

13. The price of SPA-H steel

At present, the price of SPA-H steel ranges from USD500 to USD800 per ton, and the price is also different for different sizes. Prices vary from time to time. The price of SPA-H steel is affected by raw materials, specifications and dimensions, production technology, performance standards, regions, transportation costs, etc., and is often changed. If you are interested in purchasing SPA-H steel, please contact us and we will provide the latest price list.

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