PMI on Duplex Stainless Steel and Stainless Steel

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Valves for Oil and Gas

Tuesday, 18 June 2013

Positive Material Identification (PMI) is essential for the various types of stainless

steels and corrosion-protection steel alloys.

Hence, PMI is essential for:

Stainless Steel 316, 304, 410, etc;

Duplex Stainless Steel (22% Cr);

Super Duplex Stainless Steel (25% Cr);

Hastelloy;

Inconel;

Monel.

For Duplex Stainless Steel and Stainless Steel valves, PMI is conducted by using PMI XRF portable

test gun, pointed at the external surface of completed valves. Parts of valves to be PMI tested

are:

a) Body,

b) Bonnet;

c) Stem (for all valves having externally-exposed stems).

For Duplex Stainless Steel and Stainless Steel, which are the more common materials used for oil

and gas industry, the main material composition to be PMI tested are Chromium (Cr), Nickel

(Ni) and Molybdenum (Mo).

Composition to be tested are as follows:

Material type Steel Grade Cr Ni Mo

Stainless Steel Casting ASTM A351 Gr CF8M 18.0% - 21.0% 9.0% - 12.0% 2.0% - 3.0%

Duplex Stainless Steel Casting ASTM A890 Gr 4A 21.0% - 23.5% 4.5% - 6.5% 2.5% - 3.5%

Stainless Steel Forging ASTM A182 Gr F316L 16.0% - 18.0% 10.0% - 15.0% 2.0% - 3.0%

Duplex Stainless Steel Forging ASTM A182 Gr F51 21.0% - 23.0% 4.5% - 6.5% 2.5% - 3.5%

The above are the most common types of stainless steel and duplex stainless used in valves for

petrochemical, oil and gas industry.

For me, as a Quality Control Consultant for the past 2 decades, PMI (positive material identification)

is the most important Quality Control practice for ensuring correct valve material, hence, the strength

and properties of the specific types of steel.

My email contact: [email protected]

Facebook Page: www.facebook.com/ValvesForOilAndGas

Facebook Personal: www.facebook.com/Michael.Valves

PMI on Duplex Stainless Steel and Stainless Steel ▼ 2013 (3)

▼ June (3)

PMI on Duplex Stainless Steel

and Stainless Steel

Forged Steel Ball Valves

Positive Material Identification -

PMI

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Posted by Michael Valves at 01:06

Labels: chromium, Cr, duplex stainless steel, hastelloy, inconel, Mo, molybdenum, monel, Ni, nickel,

PMI, stainless steel, super duplex stainless steel, valve

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Documents

PMI on Duplex Stainless Steel and Stainless Steel