- GB/T4171
- China
- Stock
- 09CuPCrNi/Q355GNH
GB/T4171 09CuPCrNi/Q355GNH Weathering Steel Pipe is mainly used for steel structures exposed to the atmosphere for a long time, such as railways, vehicles, bridges, and towers.
GB/T4171 09CuPCrNi/Q355GNH Weathering Steel Pipe
GB/T4171 09CuPCrNi/Q355GNH Weathering Steel Pipe
GB/T4171 09CuPCrNi/Q355GNH Weathering Steel Pipe
GB/T4171 09CuPCrNi/Q355GNH 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 plain carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. It has the strength and toughness of high-quality steel. Plastic extension, forming, welding and cutting, abrasion, high temperature, fatigue resistance and other characteristics;
The weather resistance is 2-8 times that of ordinary carbon steel, and the paintability is 1.5-10 times that of ordinary carbon steel. At the same time, it has the characteristics of rust resistance, corrosion resistance and longevity of components, thinning and consumption reduction, and labor and energy saving.
Weathering steel is mainly used for steel structures exposed to the atmosphere for a long time, such as railways, vehicles, bridges, and towers. 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.
Weather-resistant structural steel GB/T4171 09CuPCrNi/Q355GNH
1. Weathering steel is a steel that adds a small amount of alloying elements such as Cu, P, Cr, Ni, etc. to form a protective layer on the surface of the metal substrate to improve the resistance to atmospheric corrosion. Weathering steel has the properties of high-quality steel such as toughness, ductility, forming, welding, abrasion, high temperature, fatigue resistance, etc.; weather resistance is 2 to 8 times that of normal carbon steel, and paintability is 1.5 to 10 times that of normal carbon steel. . At the same time, it has the characteristics of rust resistance, corrosion resistance and longevity of components, thinning and consumption reduction, and labor and energy saving.
2. Q355GNH:
Q——The first letter of the Chinese pinyin of "Qu" in the yield strength;
355——The lower limit of the lower yield strength of steel, in N/mm²;
GNH——respectively the first letter of "Gao, Nai, Hou" Chinese Pinyin;
Quality grades are divided into A, B, C, D, E
(1)Q355GNH executive standard: GB/T 4171-2008
(2)Q355GNH smelting method: the steel is smelted by converter or electric furnace, and it is killed steel.
3. Allowable deviation of size:
The size, shape, weight and allowable deviation of hot-rolled steel plates and steel strips should meet the requirements of GB/T 709.
4. GB/T4171 09CuPCrNi/Q355GNH delivery status: hot-rolled steel is delivered in hot-rolled, controlled-rolled or normalized state.
5. GB/T4171 09CuPCrNi/Q355GNH chemical composition:
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Chemical composition
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| Grade | C | Si | Mn | P | S | Cu | Cr | Ni | other |
| Q355GNH | ≤0.12 | 0.20-0.75 | ≤1.00 | 0.07-0.15 | ≤0.02 | 0.25-0.55 | 0.30-1.25 | ≤0.65 | a,b |
Note: a, In order to improve the performance of steel, one or more trace alloying elements can be added: Nb 0.015%~0.060%, V 0.02%~0.12%, Ti 0.02%~0.10%, Alt ≥0.020%. If the above elements are used in combination, the content of at least one element should reach the lower limit of the above chemical composition.
b, The following alloying elements can be added: Mo ≤0.30%, Zr ≤0.15%.
6. GB/T4171 09CuPCrNi/Q355GNH mechanical properties and process properties
| Stretching test | 180° bending test | ||||||||||
| Yield Strength Mpa | tensile strength Mpa | Elongation% | |||||||||
| ≤16mm | 16-40mm | 40-60mm | ＞60mm | ≤16mm | 16-40mm | 40-60mm | ＞60mm | ≤6mm | 6-16mm | ＞16 | |
| 355 | 345 | -- | -- | 490-630 | 22 | 22 | -- | -- | a | 2a | 3a |
Note: a is the thickness of the steel plate.
7. GB/T4171 09CuPCrNi/Q355GNH impact performance
| quality grade | V-notch impact test | ||
| Sample direction | Temperature/℃ | Impact absorption energy KV2/J | |
| A | Vertical | -- | -- |
| B | +20 | ≥47 | |
| C | 0 | ≥34 | |
| D | -20 | ≥34 | |
| E | -40 | ≥27 | |
Note: The size of the impact sample is 10mm*10mm*55mm.
8. Application of GB/T4171 09CuPCrNi/Q355GNH Weathering Steel Pipe
It is mainly used for steel structures exposed to the atmosphere for a long time, such as vehicles, containers, buildings, towers or other structural parts. 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.
The called of Q355GNH weathering steel Pipe
GB/T4171-2008 is divided into high weathering steel and welded weathering steel. The grades of this type of steel are composed of the letter Q representing "QuFu" and the letter GNH of "GaoNaiHou", the letter NH of "NaiHou" and the quality grade of steel (A, B) , C, D, E) sequential composition, such as Q355GNHC, Q460NHD.
High weathering steel is divided into four grades: Q295GNH, Q355GNH, Q265GNH, and Q310GNH according to the standard; welded weathering steel is divided into seven grades: Q235NH, Q295NH, Q355NH, Q415NH, Q460NH, Q500NH, and Q550NH according to the standard.
Its chemical composition (conventional C, Si, Mn, S, P five elements and Tu, Cr) smelting analysis is stricter than the chemical composition smelting analysis of the corresponding grades of low-alloy high-strength structural steel, especially the low content of C, S, and P elements .
The mechanical properties are basically equivalent to the chemical composition and mechanical properties of the corresponding grades of low-alloy high-strength structural steel, such as Q460C. The quality grade of steel is only related to the impact toughness test temperature and impact energy value of steel.
In order to improve the performance of steel, various grades are added with several trace alloying elements: Ni, Nb, V, Ti, Mo, Zr, AI, etc., to form a protective layer on the surface of the metal substrate to improve atmospheric resistance.
The delivery state of the steel is hot rolled or normalized. The steel grades Q460NH, Q500NH, and Q550NH have high yield strength. In order to improve their hardenability, they are delivered in a quenched and tempered state to improve their material processing and forming. Solderability performance.
Features of weathering steel:
1. Rust and corrosion resistance, 4-8 times higher atmospheric corrosion resistance than ordinary steel
2. The materials are recyclable, very low-carbon and environmentally friendly
3. Steel parts are anti-corrosion and life extension, thinning and consumption reduction, saving labor and energy
4. Green and environmental protection, no need for initial painting; it can reduce the use of fireproof paint and fireproof coating, thereby reducing pollution, shortening the construction period, reducing costs and reducing maintenance.
Q355GNH weathering steel, that is, atmospheric corrosion resistant steel, is a low alloy steel series between ordinary steel and stainless steel. Weathering steel dao is made of plain carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. It has the strength of high-quality steel. Toughness, ductility, forming, welding and cutting, abrasion, high temperature, fatigue resistance, etc.; weather resistance is 2-8 times that of normal carbon steel, and paintability is 1.5-10 times that of normal carbon steel. At the same time, it has the characteristics of rust resistance, corrosion resistance and longevity of components, thinning and consumption reduction, and labor and energy saving. Weathering steel is mainly used for steel structures exposed to the atmosphere for a long time, such as railways, vehicles, bridges, and towers. 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.
Product key description, this is a very good product description, detailing our product use, product characteristics