What is ASTM A105 grade

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What is ASTN A105?

In mechanical engineering ASTM A105 is also called ASME SA 105. This material grade for carbon steel covers only seamless forged carbon steel piping components. Generally, it is used for the manufacture of forge piping accessories, like elbow, reducer, many types of flanges. This carbon steel material grade ASTM A105 is used for low and high temperature service with low- and high-pressure systems. But there are some limitations for this grade and other grades as well. The measure used component used by ASTM A105 grade is as follows. Flanges Valve body, forged fittings such as elbow, coupling, owlets, soc-olet, weld lets, tees, pressure, vessel forge components such as a self-reinforced nozzle, nozzle neck etc as consulted by the designer. And that used in many industries such as oil and gas, petrochemical, power plant, etc.This alloy temperature during forge is approx. between 1,700df and 2,200df, followed by quenching and tempering. Df stands for degree Fahrenheit. The fully killed carbon steel material is used for forging applications. The material form can be put in bar or ingot to meet all type for forging requirements. 

Heat treatment

Heat treatment is not mandatory for all applications except for flanges above class 300, flanges of special design where the design pressure or design temperature are not known and for items over 100 nb or 4 inch and above class rating 300. When heat treatment is required, annealing, normalizing, normalizing and temper, normalizing, quench, and tempering shall be the applied methods. The following heat treatment method are used that are 

Chemical composition

 element composition in % noted, c carbon -.35, manganese .60-1.05, phosphorus .035, sulfur .040, silicon .10-35 copper .40, note a nickel.40, note a chromium.30, note a, b molybdenum.12, note a,b vanadium.08, note a. This is the max value consider. Some abbreviation is given below for the above mentioned short text- note a – this represents the sum of cu, ni, cr, mo and va shall not exceed 1.00%. Cu, ni, cr, mo and va represent copper, nickel, chromium, molybdenum and vanadium Note b – this represents the sum of cr & mo shall not exceed .32%. Note c – this represents the sum for each reduction of 0.01% below the specified carbon maximum (.35%), an increase of .06% manganese above the specified maximum (1.05%) will be permitted up to a maximum of 1.65.

Mechanical properties

The mechanical property for ASTM A105 shall we matched with tensile 70 ksi, min yield, note a -(36 ksi, min) elongation in 2in, basic minimum for wall 5/16″ and over, strip test – 30%, hardness – 187 hbw max, note a – determined by either the 0.2% offset method or the 0.5% extension-under-load method. Other test methods available as listed in A105.

Welding process ASTM A105

These components can be welded easily. Welding procedures need to comply with ASME boiler and pressure vessel code section ix. And the procedure of welding also needs to be followed.

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