A-286 / UNS S66286 High Temperature Alloys For Offshore Oil And Gas Wellhead

High temperature alloy A-286, UNS S66286 for oil-gas wellhead, X-mas trees & Tubing hanger etc

1 PRODUCT

High temperature alloy A-286, UNS S66286 for offshore oil and gas wellhead, X-mas trees & Manifolds (incl. Tubing hangers), BOPs etc.

Alloy A-286 is available from us as round bar, flat bar, hexagonal bar, shaped bar, forging, forging block, plate, sheet, strip, wire, pipe and tubes, fasteners, bolts & nuts etc.

2 EQUIVALENT DESIGNATION

GH2132, UNS S66286, AMS 5525, 5731, SAE HEV7, W.Nr.1.4944, 1.4980, X5NiCrTi26-15, ZbNcT25(France), ATVSMo(France), DTD5026(UK), INCOLOY® ALLOY A-286, CarTech® A-286 Alloy.

3 OVERVIEW

Alloy A-286(Fe-25Ni-15Cr) is an iron based austenitic precipitation reinforced iron-nickel-chromium high temperature alloy, which is integrated strengthening with molybdenum (Mo), titanium (Ti), aluminum (Al), vanadium (V) and trace boron (B). It has high yield strength and persistent and creep strength under 650℃, and it has good machining plasticity and satisfactory welding performance. Also Alloy A-286 is known for its good strength and oxidation resistance especially at temperatures up to 1300°F (704°C).

Alloy A-286 has high yield strength, persistent and creep strength under 650℃, and it has good machining plasticity and satisfactory welding performance.

A-286 is a kind of alloy with high temperature strength and high temperature resistance to oxidation.

Characteristics of Alloy A-286

● Good machinability

● Excellent fabrication characteristics

● Good oxidation resistance up to 800°C

● Can be produced by AOD reefing or vacuum induction melting

● Good creep-rupture strength during extended high-temperature exposure

● Non-magnetic even after severe cold deformation

● High ductility in notched sections

● Very high corrosion resistance

● Good for moderate corrosion applications in aqueous solutions

● High mechanical properties due to age-hardenability

● Good creep-rupture strength during extended high-temperature exposure

● High strengths that are well retained up to 700°C

4 APPLICATION

It is widely used in the manufacture of components on aeroengines and industrial gas turbines, such as turbine blade, afterburner, fasteners, etc., and also widely used in automobile engines, also used as high-temperature bearing parts of aeroengines, such as turbine discs, which are under 650℃ for long-term operation.

Alloy A-286 is also very popular in offshore oil and gas industry where high levels of heat and stress are a factor. The alloy can produce deformation products of various shapes, such as disc, forging, plate, bar, wire and ring, etc.

It is also used for fastener applications in automotive engine and manifold components subject to high levels of heat and stress and in the offshore oil and gas industry.

Superior Alloy A-286 is developed on the basis of Alloy A-286. As long as the purity of alloy is improved, gas content is limited, low melting point element content is controlled, and heat treatment system is adjusted, the thermal strength and long-term performance of alloy can be improved.

Typical application includes

Pumps & High Pressure Components

Other Power Generation Components

Wellhead, X-mas trees & Manifolds (incl. Tubing hangers), BOPs

Flowlines & Connectors

Valves & Actuators

Comp. for Chemical plants (incl. LNG, FGD, Urea, LDPE, etc.)

Tubular Products, Flanges, Fittings

Forging Applications

Lamps/Lenses for Automotive

Fasteners, Bolts & Nuts

Turbine and Engine Parts (Aerosp)

Blades & Shafts for Turbines and Compressors

Comp. for Industrial Gas Compressors

Steam Valves

Aircraft components

Non-magnetic low-temperature Cryogenic equipments (-423º F)

shafts

Compressors

After burner parts

Manifold Components in the oil and gas industry

Jet engine components

5 CHEMICAL COMPOSITION

6 PHYSICAL PROPERTIES

Density: 0.287 lb/in3 (7.94 g/cm3)

Melting range: 1371-1427°C(2500-2600°F)

Modulus of Rigidity (G): At 70°F (20°C): 11.2 x 103 ksi (77.0 GPa)

Thermal Conductivity: 88 Btu-in/ft2hr-°F, (12.7 W/m-K)

Mean Specific Heat: 0.1100 Btu/lb/°F (104 to 1299°F)

Magnetic Permeability

Solution Treated: 1.0100Mu

Solution Treated and Aged: 1.0070Mu

7 MECHANICAL PROPERTIES

Typical mechanical properties at room temperature

Typical valves hot hardness data

Stress Rupture

Alloy A-286 alloy is designed to withstand elevated temperature strength.

Typical Creep Strength and stress rupture strengths of material aged at 1325°F (718°C) are shown below.

Creep strength

V-notch charpy impact strength

8 CORROSION RESISTANCE

Alloy A-286 has corrosion resistance similar to austenitic stainless steels in many environments. It has superior corrosion resistance to nickel-base alloys when exposed to sulfur contaminated atmospheres at elevated temperatures.The corrosion resistance of this alloy is excellent up to 1300 °F(704 °C) against many atmospheres encountered in jet engine service. Up to 1800 °F(982 °C), the oxidation resistance of alloy A-286 is equivalent to that of 310 Stainless Steel.

9 WORKING INSTRUCTION

Hot working

Alloy A-286 has similar hot working properties as compared to austenitic stainless steels. It is rolled or forged from temperatures of 1900/2050°F (1038/1121°C) using a short soaking period. It is slightly more resistant to deformation than the austenitic stainless steels during hot working. Do not forge below 1700°F (927°C). 15–20% minimum reduction should be combined with a low finishing temperature to produce a fine, uniform grain size. The formability of Alloy A-286 in the solution annealed condition is similar to Type 310 stainless steel.

Cold working

In the solution treated condition, Alloy A-286 can be satisfactorily cold drawn and formed. It is somewhat stiffer than stainless steels such as Types 316 and 310, and it work hardens rapidly.

Machinability

Being an austenitic Stainless Steel with 24% nickel content, Alloy A-286 is an iron-base alloy which is easier to machine as compared to nickel-based precipitation-hardening steels.

The machinability of Alloy A-286 is similar to that of the austenitic stainless steels specifically stainless steel type 310. Alloy A-286 is usually machined in the full aged or partially aged condition.

Carbide insert tools are commonly used for machining Alloy A-286.

In general, the high temperature alloys are more difficult to machine than stainless steels. However, the iron-base alloy group, of which Alloy A-286 is a member, is easier to machine than the nickel-base precipitation-hardening grades such as Alloy 718 or cobalt-bearing grades such as Alloy 41. Carbide insert tools are commonly used where possible.

10 HEAT TREATMENT

Solution treatment

Two methods of heat treatment are suggested for this alloy:

(1) Heat to 1800°F (982°C), hold 1 hour at heat, then cool rapidly.

(2) Heat to 1650°F (899°C), hold 2 hours at heat, then cool rapidly.

The first solution treatment method results in increased rupture strength after aging, while the second results in better ductility and higher hardness.

Aging

Heat to 1300/1400°F (704/760°C), hold 12 to 16 hours at heat, then air cool. Hardness is approximately 300 BHN.

A two cycle precipitation hardening treatment is occasionally specified after solution treatment at 1650°F (899°C). This treatment of 1300/1400°F (704/760°C), hold at heat for 16 hours, then air cool plus 1200°F (649°C), hold at heat for 8 to 12 hours, then air cool is intended to improve notch rupture strength while gaining the ductility and hardness advantages of a 1650°F (899°C) solution treatment.

11 COMPETITIVE ADVANTAGE

(1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Patented technologies.
(4) Excellent performance.

12 STANDARD SPECIFICATION

Alloy A-286 is listed in NACE MR0175 for oil and gas service.

Seamless Pipe & Tube

AMS 5731 / AMS 5732 / AMS 5734 / AMS 5737 / AMS 5895

Bar and rod

ASTM A 453 Grade 660 Class A and B

ASTM A 638 Grade 660 Type 1 and 2

ASTM A473 / ASTM B564 / ASME SA-638

SAE J467-A286

AMS 5726 / AMS 5731 / AMS 5732 / AMS 5734 / AMS 5735 /AMS 5736 / AMS 5737 / AMS 5853 / AMS 5895

GEB50T1181 / GEB50T12 / GEB50T81

GEC50TF78 / GEC50TF27 / GEC50TF20

AECMA Pr EN 2171 / AECMA Pr EN 2119 / AECMA Pr EN 2173

BS HR 51 / BS HR 52 / BS HR 560

DTD 5076

EZ 6NCT25-15

Plate, sheet and strip

ASTM B670 / ASTM B906
AMS 5525 / AMS 5858

GEB50T1181 / GEB50T12 / GEB50T81

AECMA Pr EN 2175 / AECMA Pr EN 2417

Wire

AMS 5726 / AMS 5731 / AMS 5732 / AMS 5734 / AMS 5737 / AMS 5805 / AMS 5853 / AMS 5895

Forgings

AMS 5731 / AMS 5732 / AMS 5734 / AMS 5737 / AMS 5895

GEB50T12 / GEB50T81

AECMA Pr EN 2172 / AECMA Pr EN 2399

13 BUSINESS TERM

With background of more than 50 years of material R&D experience, CMMC is a high-tech enterprise specialized in production of high temperature alloys, corrosion resistant alloys, precision alloys, wear resistant alloys, refractory alloys and other special alloys.

With main smelting equipments by CONSARC, including vacuum induction melting furnace (VIM 3 metric tons x 1 set), inert gas protective electric slag remelting furnace (IG-ESR 5 metric tons x 1 set, 10 metric tons x 2 sets), vacuum arc remelting furnace (VAR 10 metric tons x 1 set), CMMC has an annual production capacity of 3000 metric tons.

Established in 2016, CMMC stll having an investing plan of more than 30 million U.S.Dollars in the coming 5 years. CMMC aspires to become an internationally renowned supplier and leading brand of key materials for core components of high-end equipments in the application fields of aerospace, clean energy, petroleum, chemical engineering, medical, marine engineering, food and automobile, etc.

Our main products include forgings, bars, rods, tubulars, plates, sheets, strips, wire rods, precision wires, etc.

From ultra-pure smelting, hot and cold forming, heat treatment, mechanical processing to finish machining, CMMC provides the whole process of one-stop professional services.

From demand idea to research and development, from technology innovation to promoting of products upgrading, from customer's puzzles and difficulties to final solution, from smelting to market, no matter wherever, whenever, whatever and however, CMMC always try to provide satisfactory one-stop service.

By providing better materials to make a better world, CMMC never give up the dream.