People always confused about how to describe steel pipe dimensions (sizes) in correct ways, or how to clarify to seller what exactly pipe size we are going to purchase. In case any misunderstandings or a different size we purchased, that will be a big trouble.

ASTM A335 pipe (with Grade P9, P11, P22, P91 pipes) has been widely used in different industries for high temperature, high pressure services. According to market data, it is one of the most consumption alloy pipes in boiler industry, heat exchanger, power station, high and super high pressure vessels.

People always confused about how to describe steel pipe dimensions (sizes) in correct ways, or how to clarify to seller what exactly pipe size we are going to purchase. In case any misunderstandings or a different size we purchased, that will be a big trouble.

The alloy steel pipe is specified by the AISI four digit number. They contain different types of steel, and their composition exceeds B, C, Mn, Mo, Ni, Si, Cr and Va limits set for carbon steel.

The wear-resistant pipeline system is widely used in coal-fired power plants for various purposes, including transporting coal slurry to a nearby sedimentation tank, transferring limestone slurry to a absorber spray tower to remove sulphur dioxide (SO2) and hydrogen from flue gas (HCl) and calcium sulphate byproducts for the flue gas desulfurization process. After analysis and research, it is considered that the main factors affecting the failure of drill stem wear ring are the abrasiveness of the stratum, the choice of high abrasive and the technology of volatilization.

Seamless pipes are widely used in nuclear devices, natural gas, petrochemical, shipbuilding and boiler industries. Seamless pipe occupies 65% of the market share of China's boiler industry. Main customers in the international market: Alston, bucke, SIEMENS Austria, Brazil petroleum, Dou Shan heavy industries, Hyundai, Essar, BHEL..

A standard pipe bevel angle for welding is 37.5 degrees. Other angles and special forms such as J-Bevels can also be produced on the ends of pipe or tube using automatic beveling machines.

Standards: ASTM A192 (ASME SA192) Applications: Heat exchangers, condensers, heat transfer equipment, similar pipes and as superheater tubes for high pressure settings. Sizes: O.D.: 28-168; W.T.: 2-30; L: max 12000

ASTM A672 standard specification for electric fusion welded steel pipe for high pressure service at moderate temperatures.

ASTM A333 standard specification for seamless and welded steel pipe for low-temperature service and other applications with required notch toughness. This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. Chemical Requirements of ASTM A333

ASTM A252 standard specification for welded steel pipe piles. This specification covers nominal wall cylindrical steel pipe piles in which the steel cylinder acts as a permanent load-carrying member or as a shell to form cast-in-place concrete piles. Each welded pile shall be made by seamless, electric resistance welding, flash welding or fusion welding with longitudinal, helical-butt, or helical-lap seams.

Equivalent material: 35crmo4 under Italy standard. 34crmo4 under NBN standard 2234 under Sweden standard SCM432/SCRRM3 under JIS standard

SCM420 alloy steel pipe harden ability is higher, no temper brittleness, weld ability is quite good, form the cold cracking tendency is small, can be good mability and cold plastic strain. Characteristics and application: SCM420 seamless pipe in conditioning or carburizing and quenching condition, used in the manufacture of the corrosive medium and working temperature below 250 ℃, the medium containing hydrogen nitrogen mixture work of high pressure pipe and all kinds of fasteners, the more senior carburized parts, such as gear, shaft, etc.

JIS G 4053 SNCM 439 Seamless Steel Pipes Standard : JIS G 4053 Equivalent material: 40CrNiMoA , 4340 , 817M40 ,816M40 Delivery condition : By heat treatment (normalizing, annealing and high temperature tempering) or heat treatment state delivery, delivery status should be indicated in the contract

ASTM A135 is for electric-resistance-welded steel pipe intended for conveying gas, vapor, water or other liquid.

API 5L Standard aims to gas and water in oil and gas industry for reference, which is used for seamless steel pipe and welded steel pipe,including common port and port, pipe socket port and direct stream tube (TFL) and port has for a particular connection tube processing. API 5L Standard is including steel grade(GR.B，X42 ，X46，52，X56，X60，X65，X70).

Equivalent material: SCM440 under JIS Standard. 42CrMo4 under DIN standard 708M40/708A42/709M40 under BS standard 42CrMo under GB Standard 4140 seamless tube chemical composition and mechanical properties

Equivalent material: 35crmo4 under Italy standard. 34crmo4 under NBN standard 2234 under Sweden standard SCM432/SCRRM3 under JIS standard

Schedule 80 steel pipe refers to a wall thickness classification defined by the American National Standards Institute (ANSI) and the American Society of Mechanical Engineers (ASME). The actual wall thickness of Schedule 80 pipe depends on its nominal pipe size (NPS) — the larger the diameter, the thicker the wall in absolute terms.

When it comes to steel pipes, corrosion resistance is always a key concern. One of the most commonly used methods to enhance durability is galvanization. Among the different galvanization techniques, pre-galvanized steel pipes stand out as a widely adopted solution in construction, infrastructure, and industrial projects.

The length of a steel casing pipe depends on its diameter, installation environment, and application requirements. While standard lengths are commonly used, specific projects may require customization. Choosing the right length is essential to ensure both installation efficiency and long-term performance.