Alloy Steel
ASTM A335 PIPES | ASTM A335 GR P5 PIPES | ASTM A335 GR P9 PIPES | ASTM A335 GR P11 PIPES | ASTM A335 GR P22 PIPES | ASTM A335 GR P91 PIPES
Alloy steel is alloyed with many materials including molybdenum, chromium, nickel, manganese, and a few trace elements. An Alloy Steel Pipe provides moderate corrosion resistance. These pipes are used in applications where the carbon steel pipes cannot suffice. They are designed with excellent mechanical properties. These steel alloy pipes have a tensile strength of minimum 415Mpa and yield strength of minimum 205Mpa. The ASTM A335 Pipe is a high-temperature pipe. These pipes can withstand temperatures up to 375 degrees C. They are widely used in petrochemical, oil and gas, nuclear industries, etc. We are the top Alloy Steel Pipe suppliers in Mumbai. IBR approved Alloy Steel Welded Pipe and ASME SA 335 Drill Pipes are suitable for High Temperature applications and boilers
Alloy Steel Pipe Specification
| Size Range | 1/8" - 26" |
|---|---|
| Schedule | 20, 30, 40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH |
| Specification | ASTM A335 GR. P1/ P5/ P9/ P11/ P22/ P91 |
| Heat Treatment | Full or Isothermal Anneal, Normalize and Temper, Subcritical Anneal, Quench and Temper |
Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminium. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are composed in different proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.
The most important and desired changes in alloy steel are:
- Increased corrosion resistance.
- Increased harden-ability.
- Retention of hardness and strength.
Almost all alloy steels are heat treated to bring out their best properties.
The most commonly used grades of Alloy Bar:
- Grade 4140– Chromium Molybdenum Steel
- Grade 4340– Nickel-Chromium-Molybdenum Steel
- Grade 6150– Chromium Vanadium Steel
- Grade 8620– HSLA -Nickel-Chromium-Molybdenum Steel
Alloy steel
Alloy Steel is formed when other elements comprising metals and non-metals are added to carbon steel. These alloy steels have various properties such as environmental, chemical and physical. They vary as per elements that are used to alloy.
Types of alloy steel
There are two kinds of alloy steel:
- Low-alloy steel
- High-alloy steel.
Since the composition and proportion of alloying elements determine the different properties of alloy steel. Low-alloy steels are the ones which have up to 8% alloying elements whereas high-alloy steels have more than 8% alloying elements.
Alloying elements
There are around 20 alloying elements that can be added to carbon steel to produce various grades of alloy steel. These provide different types of properties. Some of the elements and their effects are:
Aluminium – can rid steel of phosphorous, sulfur and oxygen
Chromium – can increase toughness, hardness and wear resistance
Copper – can increase corrosion resistance and harness
Manganese – can increase high-temperature strength, wear resistance, ductility and hardenability
Nickel – can increase corrosion, oxidation resistance and strength
Silicon– can increase magnetism and strength
Tungsten – can increase strength and hardness
Vanadium – can increase corrosion, shock resistance, strength and toughness.
Other alloying elements that provide varied properties include bismuth, cobalt, molybdenum, titanium, selenium, tellurium, lead, boron, sulphur, nitrogen, zirconium and niobium. These alloying elements can be used singly or in various combinations depending on the properties desired.
Alloy steel products and their applications
There are hundreds of products that can be manufactured with alloy steels of varying compositions. These include alloy steel pipes and tubes, alloy steel plates, sheets and coils, alloy steel bars, rods and wires, alloy steel forged fittings, alloy steel butt-weld fittings, alloy steel flanges, fasteners and more. Alloy steels are heavily used in various industries such as buildings, appliances, automobiles, mining, machinery and equipment, railways, road construction and off-shore applications.
Applications in building large structures
In the building and construction industry, alloy steels are used for large structures such as airports, bridges, skyscrapers and stadiums in the form of a steel skeleton. The strength of alloy steels is required to support such large structures. Even concrete structures use alloy steels as reinforcement to add strength and reduce the overall weight of structures. Smaller items such as screws, nails and bolts made of alloy steels are used in the building and construction industry.
Applications in building bridges
Alloying elements like nickel, copper and chromium is specially used for bridges as a special alloy steel known as weathering steels. These provide enhanced protection from corrosion. Weathering steels is also used in buildings as facing material to improve aesthetics. Weathering steel offers several benefits which include high safety, ease and quickness of construction, aesthetic looks, shallow depth of construction, low maintenance and amenable to alterations in the future. Because of its natural weathered finish, no painting is required thus avoiding environmental issues caused by paints. Weathering steels are extremely cost-effective in the long run.
Alloy steel flat products
Alloy steels are used to make flat products – plates and strips. Plates are available in a wide range of grades and sizes. These are used in building construction by welding plates into fabricated sections.
Alloy steel strip and coil products
Strips are available as hot and cold rolled strips and hot-dipped galvanised coils. Hot-dipped galvanised coils are used to make construction products that include wall and roof claddings, side rails, roof purlins, light steel frames and lintels.
Alloy steel long products
Alloy steels are employed in producing long products used in the construction industry such as girders, structural sections, bars, rails, rods and wires.
Alloy steel flanges
Another important product made of alloy steels are flanges. These are used in stainless steel pipelines. These flanges can be made to suit various applications. Some of them include weld neck flanges which have the same thickness and bevel as of the pipe and can perform well under harsh conditions of high pressure, high temperature or sub-zero temperatures. Lap joint flanges are slip-on flanges suitable for alloy steel piping which require regular maintenance and inspection.
Alloy steel pipe products
Alloy steel pipes are important materials in the building and construction industry because of their performance characteristics such as ductility, ease of fixing without heat treatment and high durability. They are an alloy of stainless steel, chromium and nickel. Some special types of alloy steel pipes include large diameter welded pipes, electric fusion welded pipes, welded pipes and seamless pipes. They are extremely useful for high-temperature or corrosive applications besides high-pressure environments.