ASTM A335 Pipe (ASME S/A335, Chorme-Moly) is a seamless ferritic Alloy-Steel Pipe for high temperature service. Pipe ordered to

 this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding.  

Sometimes referred to as “P Grade”, chome moly pipe is popular in P-Grades P5, P9, P11, P22, and P91.  The most common use of 

grades P11, P22, and P91 is in the power industry and petro-chemical plants,  Grades P5 and P9 are commonly used  in refineries. 


A335 is often called chrome moly pipe because of the chemical makeup of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases

 the strength of steel as well as the elastic limit, resistance to wear, impact qualities, and hardenability.  Moly increases the resistance 

to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement.  Moly is the most effective single 

additive that increases high temperature creep strength.  It also enhances the corrosion resistance of steel, and inhibits pitting.  

Chromium (or chrome) is the essential constituent of stainless steel.  Any steel with 12% or more Chrome is considered stainless.  

Chrome is virtually irreplaceable in resisting oxidation at elevated temperatures. Chrome raises the tensile, yield, and hardness 

at room temperatures.  The composition chrome moly alloy steel pipe make it ideal for use in power plants, refineries, petro chemical plants, 

and oil field services where fluids and gases are transported at extremely high temperatures and pressures.  

ASTM A519 carbon and alloy steel mechanical tubing

Application:

For mechanical engineering

For mechanical and pressure use,and also for transporting steam,water,gas and etc.

ASTM A519 specification covers for several grades of carbon and alloy steel mechanical tubing, either hot-finished or cold-finished.

Pipe and Tube Specifications of ASTM A519

This specification covers for several grades of carbon and alloy steel mechanical tubing, either hot-finished or cold-finished. The steel used in the mechanical tubing may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required. The seamless tubing is a tubular product made without a welded seam. It is usually manufactured by hot working steel, and if necessary, by subsequently cold finishing the hot-worked tubular product to produce the desired shape, dimensions and properties.

The tubes shall be furnished in the following shapes: round, square, rectangular and special sections. Heat analysis shall be made to determine the percentages of the elements specified. If secondary melting processes are used, the heat analysis shall be obtained from one remelted ingot or the product of one remelted ingot of each primary melt. The tubing shall be coated with a film of oil before shaping to retard rust when specified this abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.