Scope

this specification covers several frades of carbon and alloy steel seamless mechanical tubing.

1.1 The frades anr listed in Tables 1, 2, and 3. When welding is used for joining the weldable mechanical tube grades, the welding procedure shall be suitable for the frade, the condition of the components, and the intended service.

1.2 This specification covers both seamless hot-finished emchanical tubing and seamless cold-finished mechanical tubing in sizes up to and including 12 3/4 in.(322.8mm) outside diameter of rround tubes with wall thicknesses as required.

1.3 The tubes shall be furnished in the following shapes, as specified by the purchaser:round, square, rectagular, and special sections.

1.4 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order.

Reference documents

• ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products.
• ASTM A751测试方法，实践和用于钢铁化学分析的术语。
• ASTM A1040 Guide for Specifying Harmonized Standard Grade Compositions for Wrought Carbon, Low-Alloy, and Alloy Steels.
• ASTM A1058测试钢产品机械测试的测试方法 - 度量。

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Process

Cold drawn seamless steel tube deformed process

Cold Drawn Seamless Mechanical Tubing (CDS) is a cold drawn 1018/1026 steel tube which offers uniform tolerances, enhanced machinability and increased strength and tolerances compared to hot-rolled products.

冷绘制的钢管带有热卷钢线圈作为原材料，串联冷滚腌制以除去氧化物尺度，其完成的滚动硬卷，由于冷钢强度导致的连续冷变形而导致硬卷曲的滚动硬卷，硬度增加的指示器增加了指示器的降低了坚硬的塑料，冲压性能会恶化，只能用于简单的零件变形。

滚动硬卷可以用作热浸镀锌植物的原材料，热浸电线套件套件。滚动硬卷重通常为6至13.5吨，线圈直径为610mm。

Hot rolled seamless steel pipe deformed process

热卷无缝钢管生产基础变形过程可以总结为三个阶段：穿孔，延伸和饰面。

穿孔过程的主要目的是成为坚固的圆形钢坯刺穿空心壳。规格，准确性和表面质量中的毛细管无法满足成品的要求，需要进一步的改进来使金属通过。拉伸机的主要目的是进一步降低截面视图（主要压缩墙）以进行更大的轴向延伸，从而提高了尺寸的精度，表面质量和组织性能。

After stretching machine rolled steel pipe shortage collectively need further molding mill in order to achieve the requirements of the finished pipe. Rolled steel due to pass in the method widely used in the production of seamless steel tubes.

到目前为止，由于方法，滚动钢钢可以分为两类：核心养老金而不滚动滚动（空心车身滚动），并带有mandrel。尺寸机器，降低磨坊和属于孔的伸展厂，没有曼德雷型连续滚动磨机，通常是棺材。它的主要目的是减少变形过程的直径或尺寸变成钢，过程控制的壁厚厚度可以使变薄，变厚或几乎不变。

All the traditional hole-type rolling machine with mandrel belong to extend machine. The main purpose is to reduce the deformation process perforated capillary wall thickness and outer diameter roll passes in the deformation zone and the mandrel posed, for a larger axial extension. At the same time a certain improvement in the organization, performance, accuracy, surface quality.

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工业生产中有许多用于运输的材料。具体来说，我们将有更多的选择，并且不限于使用合金钢管。但是，即使面对更多选择，许多人也倾向于选择合金钢管。人们做出自己的选择将有自己的理由。这意味着合金钢管应用程序具有其自身的优势。与其他材料制成的传输线相比，在满足基本应用要求之后，其数量更轻。然后，在合金钢管的实际应用中，因此将具有更多优势。除了其物理特征优势外，它还具有经济优势。合金钢管的广泛应用是有各种原因。因此，在实际使用方面，我们可以将优势利用为全部，这样我们可以在合金钢管的这些应用中获得更多利润。

What requirements should alloy steel pipe application meet

The transportation of kinds of gases or liquids in production needs to rely on alloy steel pipe. This shows that the actual role of alloy steel pipe application is important. High temperature resistant and low temperature resistant is the tolerance of temperature. In the practical application of alloy steel pipe, there will be many materials need to be transported. However their temperatures are not the same. So this can be the basic requirement to alloy steel pipe. It needs more corrosion resistance. Corrosion resistant material is the best material during transporting, because it is corrosion resistant. So it can be used in more occasions. And it is definitely very convenient for users.

The biggest advantages of alloy steel pipe

Can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy steel pipe total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy steel pipe to provide a wider space for the development of the industry. The future needs of the average annual growth of China’s high-pressure alloy steel pipe long products up to 10-12%.

Specification, standard and identification of alloy steel pipes

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

Industries We Serve

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The biggest advantages of alloy steel pipecan be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy tube total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy tube to provide a wider space for the development of the industry. According to the Chinese Special Steel Association alloy pipe Branch Expert Group, the future needs of the average annual growth of China’s high-pressure alloy pipe long products up to 10-12%.

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Inspection

Chemical composition inspection, mechanical properties test(tensile strength,yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension test,no-destructive test, hydrostatic test.

PMI

identification of the chemical composition of the metal used to manufacture the fitting. Uses PMI sensors, including X-ray fluorescence or optical emission spectrometry.

Size measurement

Seamless pipes with compound bevels as per ASME B16-25 And ASTM A333

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送货

Steel pipe delivery status(condition)

Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).

健康）状况on delivery of steel pipe

The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.

冷滚动的钢卷基板产品对高增值产品的深处理。例如电 - 甲变化的热浸镀锌，电 - 聚合物的指纹抗性，涂漆的钢卷曲阻尼复合钢，PVC层压钢板等广泛使用。

Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.

Packing

Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.

There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method to work prevent rusting and Sea transportation security.

• 塑料盖插在管道的两侧
• Should be avoided by the steel strapping and transport damage
• Bundled signs should be uniform and consistent
• The same bundle(batch) of steel pipe should be came from the same furnace.
• The steel pipe has the same furnace number, the same steel grade, the same specifications.

Our packing can meet any needs of the customers.

Placing steel pipes into containers