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Technical Discussions
Engineering, Inspector
V.J.T.I., India, Joined Feb 2009, 8


Engineering, Inspector
Joined Feb 2009
11:42 Feb-19-2009

1. What is the difference between IS2062 & ASTM 516 ?
2. On what basis, radiography is specified for particular vessel ( spot / full) ?
3. Difference betn A193 Gr.B7 & A193 Gr.B7M , 2H & 2HM ?
4. Diff. among GTAW, SMAW, SAW?

Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 893

Michel Couture

NDT Inspector,
Joined Sep 2006
18:41 Feb-19-2009
Re: Querry
In Reply to AJIT S PAWAR at 11:42 Feb-19-2009 (Opening).


ASTM A 516/A 516M Standard Specification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service and is one of the most popular steel grades in market .

It is primarily intended for use in welded pressure vessels where notch toughness is important. It comes in four grades 55, 60, 65 & 70. At Oakley Steel we mainly sell 516 gr 60 and 516 gr 70. These grades cover a range of tensile strengths from 55 - 90 MPa and this versatility explains much of the specifications popularity.

Carbon 0.27 - 0.31%
Manganese 0.79 - 1.3%
Phosphorous 0.035% max
Sulphur 0.035% max
Silicon 0.13 - 0.45%

IS2062 Specification of Steel for General Purpose Application
Grade C% Max. Mn% Max. S% Max. P% Max. Si% Max. C.E.% Max.
A 0.23 1.50 0.050 0.050 0.40 0.42
B 0.22 1.50 0.045 0.045 0.40 0.41
C 0.20 1.50 0.040 0.040 0.40 0.39
Grade UTS(MPa) Min. Y.S.(MPa) Min. El.% Min. 5.65 Sqrt(So) Bend
A 410 250 240 230 23 3T
B 410 250 240 230 23 2T & 3T *
C 410 250 240 230 23 2T
* 2T - <= 25mm
* 3T - > 25mm

The ASTM A193 standard covers alloy steel and stainless steel bolting materials for high temperature service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
ASTM A193 Grade B7- Chromium-Molybdenum Steel
ASTM A193 Grade B7M- Reduced tensile strength, hardness controlled to 235 Brinell max.

The ASTM A194 specification covers carbon, alloy and stainless steel nuts intended for use in high-pressure and/or high-temperature service. & Carbon Steel Nut Materials Specifications
ASTM A194 Grade 2H- Recommended use with A325 Structural Bolts, High Pressure & High Temp.
Medium Carbon Steel, Quenched and Tempered, Tempering Temp. 1000°F, Proof Load Stress, 175ksi Hardness Rockwell C24 Min. C38 Max.

ASTM A194 2HM Recommended use with A325 Structural Bolts, High Pressure & High Temp. Medium Carbon Steel, Quenched and Tempered, Tempering Temp. 1000°F, Proof Load Stress, 150ksi Hardness Brinell 159 Min. 237 Max.

Regarding the different welding processes, please go to the following link:


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