Astm A285 Seamless Cold Drawn Steel Pipe Alloy P91 P22 6"-18" For Shipyard

Astm A285 Alloy Steel Seamless Pipe P91 P22 6"-18" For Shipyard

Alloy steel pipes are used in the energy industry for high temperature and very low-temperature service

(cryogenic), or for applications with very high pressures.

ASTM A335 alloy steel pipes fit ASTM A234 WPx series buttweld fittings (WP5, WP9, WP91) and A182 Fx

forged fittings and flanges (A182 F5, F9, F11, F22, F91). All these materials have similar chemical and mechanical

properties and can be joined or welded.

Alloying elements

The addition of Molybdenum (“Moly”) increases the strength of the steel and its elastic limit, enhance

the steel resistance to wear, its impact qualities, and the hardenability. It also improves the resistance

to softening, makes chromium steel less prone to embrittlement and prevents pitting.

Chromium, a key element also for stainless steel alloys, prevents steel oxidation at elevated temperatures

and increases the resistance of steel to corrosion. It enhances the tensile, yield, and hardness properties

of low-alloy pipes at room temperatures.

Other alloying elements, present in various degrees in pipes of all grades are:

1. Aluminum: decreases oxygen from steelmaking

2. Boron: used to produce fine grain size and enhance steel hardness

3. Cobalt: used to enhance the steel’s heat and wear-resistance

4. Manganese: gives better steel hardenability

5. Nickel: Enhances toughness, hardenability and impact strength at low temperatures

6. Silicon: decreases oxygen, enhances hardenability and toughness

7. Titanium: prevents precipitation of chromium carbide

8. Tungsten: refines steel grain size and enhance the steel hardness, especially at high temperatures

9. Vanadium: gives steel enhanced fatigue resistance

As mentioned, low-alloy steels have a total amount of alloying elements below 5%; high alloy steel has a higher

percentage of these elements.

CHEMICAL COMPOSITION

The types of alloy steel covered by the ASTM A335 – ASME SA335 specification are designed with a “P” prefix,

from P5 to P92. Grades P11/P22 and P91/92 are typically found in power stations, whereas grade P5 and P9 are

more common for application in the petrochemical industry. Grades P9, P91 are, in the list, the more expensive

(a P91 seamless pipe may cost approx 5€ per kg.).

Chemical composition(%):

Mechanical properties:

Alloy pipe is a kind of seamless steel pipe. Alloy tubes are divided into structural seamless tubes and high-pressure heat-resistant alloy tubes. It is mainly different from the production standards and industries of alloy pipes. Annealing and tempering of the alloy tube changes its mechanical properties. meet the required processing conditions. Its performance is higher than that of ordinary seamless steel pipes, and its utilization value is higher. The chemical composition of alloy pipes contains more Cr, which has high temperature resistance, low temperature resistance, corrosion resistance and other properties. Ordinary carbon seamless pipes do not contain or have very few alloy components. Alloy tubes are widely used in petroleum, aerospace, chemical, electric power, boiler and other industries due to their changing mechanical properties and easy adjustment.
Alloy seamless steel pipe is a kind of seamless steel pipe, and its performance is much higher than that of general seamless steel pipe. Because this steel pipe contains more chromium, its high temperature, low temperature and corrosion resistance are unmatched by other steel pipes. Alloy tubes are widely used in petroleum, chemical, electric power, boiler and other industries.
Alloy seamless steel pipe contains elements such as silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, rare earth and so on.
Alloy Seamless Steel Tube has a hollow section with no joints around the strip. Steel pipes have hollow sections and are widely used as pipelines for transporting fluids such as oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, alloy seamless steel pipe is lighter in weight with the same bending and torsional strength. It is an economical type of steel that is widely used in the manufacture of structural and mechanical parts, such as oil transport, stair handrails, bicycle frames and steel scaffolding for construction. Using alloy seamless steel pipe to make rings can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack sleeves, etc. Steel pipes have been widely used in manufacturing. Alloy seamless steel pipes or indispensable materials for various conventional weapons, gun barrels, gun barrels, etc. must be made of steel pipes. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform, so the alloy seamless steel pipe is mostly a round pipe
Production Process
Structural seamless steel pipe: mainly used for general structure and mechanical structure. Its representative material (brand): carbon steel 20,45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo.
Seamless steel pipes for fluid transportation: mainly used for fluid pipelines in engineering and large-scale equipment. The representative material (grade) is 20, Q345, etc.
Seamless steel pipes for low and medium pressure boilers: mainly used for pipes for conveying low and medium pressure fluids in industrial boilers and domestic boilers. The representative material is 10,20 steel.
Seamless steel pipes for high pressure boilers: mainly used for high temperature and high pressure conveying headers and pipes on boilers in power plants and nuclear power plants. The representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.
Marine carbon steel and carbon-manganese steel seamless steel pipes: mainly used for I and II pressure-resistant pipes of marine boilers and superheaters. The representative material is 360, 410, 460 steel and so on.
Seamless steel pipes for high-pressure fertilizer equipment: mainly used for high-temperature and high-pressure fluid pipelines on fertilizer equipment. Representative materials are 20,16 Mn, 12CrMo, 12Cr2Mo and so on.
Seamless steel pipes for oil cracking: mainly used in boilers, heat exchangers and their transmission fluid pipelines in oil smelters. Its representative materials are 20,12 CrMo, 1Cr5Mo, 1Cr19Ni11Nb and so on.

FAQ

1. Can I get free samples?

A: Yes, we can provide you the free samples, but you need to bear their own delivery costs.

2. Can I request to change the form of packaging and transportation?

A: Yes, We can change the form of the packaging and transportation according to your request, but you have to bear their own costs incurred during this period and the spreads.

3. Can I request to advance the shipment?

A: It should be depends on whether there is sufficient inventory in our warehouse.

4. Can I have my own Logo on the product?

A: Yes, you can send us your drawing and we can make your logo, but you have to bear their own the cost.

5. Can you produce the products according to my own drawings?

A: Yes, we can produce the products according to your drawings that will be most satisfy you.

6. What's your terms of payment?

A: T/T, L/C , Alibaba Trade Assurance available, full protection for your orders.

7.Do you accept custom design on size?

A: Yes, if the size is reasonable

8.Transportation

Transported by DHL, UPS, EMS, Fedex, SF, by Air, by Sea.