Can the caliber of carbon steel stamping elbow be errored?

Yes, it is written very clearly in GB T12459-2005.

Outer diameter of all fittings: 15 65 plus or minus. 125 200 plus or minus 250 450 plus 4 minus 500 600 plus minus.

This refers to the outer diameter at the bevel.

Carbon steel stamping elbows are made of malleable cast iron, which are used for the connection of water supply pipelines, water vapor pipelines, gas pipelines, and oil pipelines. The color of the stamping elbow is black, with right-angle bending, excellent quality, wear resistance, and not easy to damage. The specification of the stamping elbow is 1 2-10 inches, and the products are widely used in pipeline installation, installation, supporting and other services in petroleum, chemical, metallurgy, electric power and other industries.

Stamping elbows can only be made of small diameters, if the pipe specifications are too large, it is difficult to buy finished stamping elbows, and only welded elbows can be used. Due to the more welds of welding elbows, all the performance is not as good as that of stamping elbows, which are easy to be corroded and leaked. And because the stamping elbow is produced in batches, it is cheaper than the welding elbow.

Now there are precision casting elbows, which can be made of 316L, and the corrosion resistance is better.

The process parameters that affect the geometry of the stamping elbow are: the material, wall thickness and outer diameter of the blank for pushing, the material and shape of the mandrel head, the heating temperature and its distribution, and the advancing speed.

With the continuous development of the world economy and the continuous improvement of income levels, we aim to face the international advanced construction industry and shipbuilding industry and other related industries. Stainless steel stamping elbows are mainly used to connect pipe fittings, which can play an important role in the development of this product and set sail with the world-class technical level. Stainless steel stamping elbow pipe fittings processing technology:

1. Used in stainless steel pipe system, the dimensional accuracy of double press-fit pipe fittings is improved, the error of the pipe is allowed to increase, and the adaptability is stronger.

2. The tensile strength of double clamping pressure is increased by several times that of single clamping pressure, and it is more suitable for high-rise buildings with high water pressure.

3. The double clamping pipe fittings will not cut the rubber ring when inserting the pipe.

4. The double clamping rubber ring is sealed in the stainless steel material, the durability of the rubber ring is significantly improved, and the double pressing sealing ring is squeezed evenly on the left and right, and the sealing ring will not be extruded from the side with double water pressure, which makes up for the shortcomings in the application process of single clamping.

5. At the double crimping joint, the pipe will not be affected by the external force when the pipe is bent and deformed by external force, and the technical performance, technical indicators and technical level of the stamping elbow pipe fitting card connection are upgraded.

The elbow is an international standard and is the national standard of the United States. The outer diameter size range of the standard is 1 2 80, generally within 24 are made of seamless steel pipe as raw material, 26 to 80 are used for steel plate stamping and then welding. The wall thickness can be up to 60mm, and the smallest is up.

The most common types of steel are carbon steel (20), alloy steel and stainless steel, with a total of 24 steel grades. The CRMO steel used on the boiler is like 15CR, and the amount is relatively large. Tee, outer diameter range, from 26 to 60 for welded tee.

Wall thickness 28, 60mm. The size of the head specification range, conventionally first say the big head specifications, and then talk about the small head specifications, the small head is the smallest, the large head is the smallest, the large head is the largest 60, the small head is the maximum 48, 20 60 is welded, the wall thickness.

China GB: GB T12459-2005

gb/t13401-2005

gb/t10752-1995

Petrochemical standards for elbows:

sh 3408-1996

sh 3409-1996

Chemical standard for elbows: HG T 21635-1987 Power standard for elbows: DL T695

Petroleum standard for elbows: SY T 0510

German standard for elbows: DIN2605

The Japanese standard of the elbow: JIS

Marine standard for elbows: GB T10752-1995 Chemical standard for elbows: HG21631-1990

Because the stamping elbow has good comprehensive properties, it is widely used in chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power, aerospace, shipbuilding and other basic projects.

The national standard stamping elbow is divided into two types: cold stamping and hot stamping, usually according to the material properties and equipment capacity, cold stamping or hot stamping.

The national standard stamping elbow is divided into two types: cold stamping and hot stamping, and cold stamping or hot stamping is usually selected according to the nature of the material and the capacity of the equipment. There are two types of national standard stamping elbows: cold stamping and hot stamping, and cold stamping or hot stamping is usually selected according to the material properties and equipment capacity. The forming process of cold extrusion elbow is to use a special elbow forming machine to put the tube blank into the outer die, and after the upper and lower molds are clamped, under the push of the push rod, the tube blank moves along the gap reserved by the inner mold and the outer mold to complete the forming process.

Stamping elbows are the earliest forming process applied to mass production of seamless elbows. In the production of common specifications of elbows, it has been replaced by hot push method or other forming processes, but in some specifications of elbows due to small production quantity, wall thickness is too thick or the product has special requirements. The punching of the elbow is made of a tube blank equal to the outer diameter of the elbow, which is pressed directly in the mold using a press.

Before stamping, the tube blank is placed on the lower die, the inner core and the end die are loaded into the tube blank, the upper die moves downward and begins to press, and the elbow is formed through the restraint of the outer die and the support of the inner die. Compared with the hot push process, the appearance quality of stamping and forming is not as good as the former; The outer arc of the stamping elbow is in a tensile state when it is formed, and there is no excess metal in other parts to compensate, so the wall thickness at the outer arc is about 10% thinner. However, due to the characteristics of being suitable for single-piece production and low cost, the stamping elbow process is mostly used for the manufacture of small batches and thick-walled elbows.

Environmental protection: PE-RT can be used without polluting the environment. However, PEX can not produce secondary pollution; Stability of workability:

PEX has problems such as controlling the degree of cross-linking and the uniformity of cross-linking, and the processing is complex and directly affects the performance of the pipe.

Easy to install, good thermal conductivity, suitable for floor heating system, and can be used. P national standard stamping elbow pipe has its excellent impact strength, can be hot-melt welding and mechanical connection, better than PB-PP-R thermal conductivity. The national standard stamping elbow can only be made of small diameter, if the pipe specification is too large, it is difficult to buy the finished national standard stamping elbow, and only the welding elbow can be used.

Due to the more welds of welding elbows, all the performance is not as good as that of the national standard stamping elbows, which are easy to be corroded and leaked. Heat-resistant, its performance is higher than other plastic pipes. And because the national standard stamping elbow is produced in batches, it is cheaper than the welding elbow.

Now there are precision casting elbows, which can be made of 316L, and the corrosion resistance is better. ‍‍

Long-term pressure resistance, only from the design stress, the national standard stamping elbow has the best pressure resistance. However, due to various factors, the actual wall thickness of the underfloor heating pipe is usually 2mm. Under this wall thickness, all kinds of pipes can meet the requirements of floor heating, and the pressure resistance advantage of the national standard stamping elbow pipe cannot be reflected;

Thermal conductivity: Pipes used for underfloor heating need to have good thermal conductivity.

Low temperature thermal shock resistance: PE--RT and PEX have better low temperature impact resistance. During winter construction, the pipe is not susceptible to impact and cracking, which increases the flexibility of the construction arrangement.

Environmental protection: PE-RT can be used without polluting the environment. However, PEX can not produce secondary pollution;

Stability of processing performance: PEX has problems such as controlling the degree of cross-linking and the uniformity of cross-linking, and the processing is complex and the processing directly affects the performance of the pipe.