Year1
- 材质：
- 合金无缝钢管
- 规格：
- 常规齐全
- 品牌：
- 国产进口
Chinese name Properties Steel Research Type Alloy Steel Pipe The chromium content is ~
An alloy steel pipe with a mainly ferrite structure under use. The chromium content is ~, and it has a body-centered cubic crystal structure. This type of steel generally does not contain nickel, and sometimes contains a small amount of b and other elements. This type of steel has a large thermal conductivity, a small expansion coefficient, good oxidation resistance, and excellent stress corrosion resistance. It is mostly used to make steel that is resistant to atmospheric water vapor, water, and oxidation. Acid corroded parts. This type of alloy steel pipe has shortcomings such as poor plasticity and significantly reduced plasticity and corrosion resistance after welding, which limits its application. The application of out-of-furnace refining technology can greatly reduce interstitial elements such as carbon and nitrogen, thus making this type of steel widely used.
It is an alloy steel pipe with austenite and ferrite structures accounting for approximately half each. In the case of lower content, the r content is ~ and the r content is ~. Some steels also contain other alloying elements. This type of steel has the characteristics of both austenitic and ferritic alloy steel pipes. Compared with ferrite, it has higher plastic toughness, no room temperature brittleness, significantly improved intergranular corrosion resistance and welding performance, while maintaining iron content. The solid alloy steel pipe has the characteristics of ℃ brittleness and high thermal conductivity, and super plasticity. Compared with austenitic alloy steel pipes, it has high strength and significantly improved resistance to intergranular corrosion and chloride stress corrosion. Duplex alloy steel pipe has excellent pitting corrosion resistance and is also a nickel-saving alloy steel pipe.
① Delivery state
Refers to the final plastic deformation or final heat treatment state of the delivered product. Generally, those delivered without heat treatment are called hot-rolled or cold-drawn rolled state, or those delivered in manufacturing state that have been heat-treated are called heat-treated state, or according to the type of heat treatment, they are called normalized quenched, tempered, solid solution annealed state. When ordering, the delivery status must be noted in the contract.
②Delivery by actual weight or delivery by theoretical weight
When delivered by actual weight, the weight of the product is delivered by weighing weight
When delivered by theoretical weight, the weight of the product It is the weight calculated based on the nominal dimensions of the steel. The calculation formula is as follows. Those who require delivery according to the theoretical weight need to indicate it in the contract
The theoretical weight of alloy pipe per meter and the density of steel are/calculation formula
In the formula, the theoretical weight of steel pipe per meter Weight, the nominal outer diameter of the steel pipe,
the nominal wall thickness of the steel pipe,.
③Guarantee conditions
Inspection according to the provisions of the current standards and ensuring compliance with the standards are called guarantee conditions. Guarantee conditions are divided into basic guarantee conditions, also known as mandatory guarantee conditions. Regardless of whether the customer indicates this in the contract. This inspection must be carried out in accordance with the standards and ensure that the inspection results comply with the standards.
Such as chemical composition, mechanical properties, dimensional deviation, surface quality, flaw detection hydraulic pressure test or process performance test such as flattening or flaring, are all must-have conditions.
In addition to the basic guarantee conditions in the standard B agreement guarantee conditions, there are other requirements based on the requirements of the buyer, which must be negotiated between the supplier and the buyer and noted in the contract. Or when requested by the buyer, there are other conditions that should be noted in the contract. Customer, Tianjin Alloy Steel Pipe has put forward stricter requirements for the basic guarantee conditions in the standard, such as component mechanical properties, dimensional deviations, etc., or added inspection items such as steel pipe ovality, uneven wall thickness, etc. The above terms and requirements shall be negotiated by both parties at the time of ordering, and a supply technical agreement shall be signed and noted in the contract. Therefore, these conditions are also called agreement guarantee conditions. Products with agreed guarantee conditions generally require a price increase.
④Batch
The batch in the standard refers to an inspection unit, that is, the inspection batch. If the batch is grouped by delivery unit, it is called a delivery batch. When the delivery batch is large, one delivery batch can include several inspection batches. When the delivery batch is small, one inspection batch can be divided into several delivery batches.
The composition of a batch usually has the following regulations. Please refer to relevant standards for details.
Each batch should be composed of steel pipes of the same grade, the same furnace tank number or the same parent furnace number, the same specifications and the same heat treatment system.
B For high-quality carbon steel structural pipes and fluid pipes, they can be composed of Tianjin alloy steel pipes of the same brand, specification and heat treatment system from different furnace tanks.
Each batch of welded steel pipes should be composed of steel pipes of the same grade and specification.
⑤High-quality steel and high-grade high-quality steel
In the B/ and B/ standards, those with words after the grade are high-grade high-quality steel, and vice versa are general high-quality steel.
High-grade high-quality steel is better than high-quality steel in some or all of the following aspects
Narrow the range of component content
B Reduce the content of harmful elements such as sulfur, phosphorus and copper
Ensure higher purity requirements for non-metals Low inclusion content ensures high mechanical properties and process performance.
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