ASTM A860/A860M-18 

Standard Specification for Wrought High-Strength Ferritic Steel Butt-Welding Fittings

pipe fittings materials data

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Abstract

This specification covers wrought high-strength low-alloy butt-welding steel fittings of seamless and electric fusion-welded construction for applications in high-pressure gas and oil transmission and distribution systems. Starting materials shall consist of plate, sheet, forgings, forging quality bar, and seamless or fusion-welded tubular products with filler metal added. Materials shall be heat treated by normalizing, quenching, and tempering or stress relieving. Specimens shall conform to required values of chemical composition and mechanical properties, namely: yield strength, tensile strength, elongation, notch toughness, and hardness. This specification does not require hydrostatic testing.

Scope

1.1 This specification covers wrought high-strength ferritic steel butt-welding fittings of seamless and electric fusion-welded construction. Dimensions of the fittings are provided in the latest revisions of ASME B16.9 and MSS-SP-75. Butt-welding fittings differing from ASME B16.9 shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M. These fittings are for use in high-pressure gas and oil transmission and distribution systems.

1.2 Optional supplementary requirements are provided for fittings when a greater degree of examination is desired. One or more of the supplementary requirements may be specified in the order.

1.3 This specification does not cover cast-welding fittings or fittings machined from castings.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

astm-a860-wphy-65-elbows-20in-sch120

astm-a860-wphy-65-elbows-20in-sch120

1. Chemical Composition Requirements of ASTM A860

The Chemical Composition of ASTM A860, %
Carbon≤0.20*A
Manganese1.00-1.45
Phosphorus≤0.030
Sulfur≤0.010
Silicon0.15-0.40*B
Nickel≤0.50*C
Chromium≤0.30*C
Molybdenum≤0.25*C
Copper≤0.35*C
Titanium≤0.05
Vanadium≤0.10
Columbium≤0.04
Vanadium plus Columnium≤0.12
Aluminum≤0.06

*The carbon equivalent C.E.=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 shall not exceed 0.42%.
*B If vacuum carbon deoxidation is used, silicon shall not exceed 0.10% by heat analysis and 0.12% by product analysis.
*C The sum of Ni+Cr+Mo+Cu shall not exceed 1.0%.

2. Mechanical Properties of ASTM A860

ASTM A860/ 860MYield Strength, min.Tensile StrengthElongation, min.Cv, avg./min.
GradeksiMPaksiMPa%ft*lbsJ
WPHY 424229060-85415-5852530/2540/34
WPHY 464631563-88435-6052530/2540/34
WPHY 525236066-91455-6252530/2540/34
WPHY606041575-100515-6902030/2540/34
WPHY 656545077-102530-7052030/2540/34
WPHY 707048580-105550-7252030/2540/34

*1. The actual yield strength shall not exceed specified minimum by more than 15 ksi [105 MPa].
*2. The elongation values shall be measured on the basis of standard round specimen, or small-size proportional specimen, in 4D.
*3. The size of Charpy V-notch specimens shall be 10×10 mm while the impact-test temperature shall be −50°F[−46°C].
*4. All fittings of ASTM A860 shall have a maximum hardness of 22 HRC(235 HBW).

3. Material, Manufacture, Heat Treatment & Tests

The high-strength pipe fittings of ASTM A860 shall be made from fully killed fine-grain material made by a melting process that is intended to produce rounded, well dispersed, fine sulphide inclusions, that promote good notch toughness, assists in the resistance to hydrogen induced cracking, and for weldability suitable for field welding. The starting raw material may consist of plate, sheet, forgings, bar, seamless and fusion-welded pipes.

astm-a860-wphy-70-tees-24in-sch160

astm-a860-wphy-70-tees-24in-sch160

All fittings shall be heat treatment by one of the methods of normalizing, quenching, tempering or stress relieving. The regular tests & inspections mainly include radiographic examination, ultrasonic test, Charpy V-Notch test, hardness test, etc. Especially, butt-weld tees manufactured by cold forming process shall be liquid penetrant or magnetic particle examined.

C&N Huitong group can produce pipe fittings of such materials :

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JIS Standard MaterialJIS G3452 Carbon steel pipes for ordinary piping
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BS EN Standard MaterialBS EN 10255 Non-alloy steel tubes suitable for welding and threading Technical delivery conditions
BS EN 10253-1 Butt-Welding Pipe Fittings  Part 1: Wrought Carbon Steel for General Use and Without Specific Inspection Requirements
BS EN 10253-2 Butt-welding pipe fittings. part 2: Non alloy ferritic alloy steels with specific inspection requirements
BS EN10253-3 Butt-welding pipe fittings Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements
BS EN 10253-4 Butt-welding pipe fittings Part 4:Wrought austenitic and austenitic-ferritic (duplex)stainless steels with specific inspection requirements