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

The drill pipe is a vital component in the drilling process, primarily responsible for transmitting torque and transporting drilling fluid. By gradually adding drill pipe sections, the wellbore is extended to the desired depth. Selecting the appropriate drill pipe size and length is crucial, as it directly affects drilling efficiency, operational costs, and safety.

The service life of oil casing and tubing is closely tied to the entire life cycle of an oil well, often determining how long the well can operate safely and efficiently. In oil and gas production, casing pipes are typically used once, cemented in place, and permanently left underground. Their longevity depends on multiple factors, including material quality, threaded connections, geological conditions, construction practices, and ongoing maintenance. In most cases, casing service life ranges between 15 and 30 years, though actual performance may vary significantly.

Galvanized steel pipe is widely used in plumbing, construction, and outdoor projects because of its excellent corrosion resistance. However, welding galvanized pipe requires extra care compared with standard steel pipe. The zinc coating that protects the pipe can release hazardous fumes when heated, and improper welding may compromise both the weld quality and the protective layer. This guide explains how to weld galvanized steel pipe safely and effectively.