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

Eelements

C

Mn

P

S

Si

Cr

Ni

Mo

Ti

Al

V

B

Fe

DIN EN 10269

0.03 – 0.08

1.00 – 2.00

≤0.025

≤0.015

≤1.0

13.5 – 16.0

24.0 – 27.0

1.00 – 1.50

1.90 – 2.30

≤0.35

0.10 – 0.50

0.003 – 0.010

Bal.

VdTÜV Werkstoffblatt 435

≤0.08

≤2

≤0.03

≤0.03

≤1.0

13.5 – 16.0

24.0 – 27.0

1.00 – 1.50

1.9 – 2.3

≤0.35

0.10 – 0.50

0.003 – 0.010

Bal.

ASTM A453 Grade 660 A/B/C/D

≤0.08

≤2

≤0.04

≤0.03

≤1.0

13.5 – 16.0

24.0 – 27.0

1.00 – 1.50

1.90 – 2.35

≤0.35

0.10 – 0.50

0.001 – 0.010

Bal.

 

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

PRODUCT	TENSILE σb/MPa	YIELD σ0.2/MPa	ELONGATION δ5/%	HARDNESS HBS
HR BAR, FORGED BAR	≥930	/	≤20	255-321
CR BAR	≥900	≥590	≤15	255-321
HR PLATE	≥885	/	≤20	/
CR PLATE	≥885	/	≤20	/
DISC	≥930	≥620	≤20	255-321

 

Typical valves hot hardness data

Temperature		Rockwell C hardness	Ultimate tensile strength		0.2% yield strength
°F	°C		ksi	MPa	ksi	MPa
Room		30-35	155	1069	100	689
1000	538	32-33	131	903	87	600
1100	593	29-30	122	841	90	621
1200	649	28-29	103	710	88	607
1300	704	26-27	86	593	86	593
1400	760	18-20	64	441	62	427
1500	816	10-15	36	248	33	228

 

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.

Temperature		Stress for rupture
°F	°C	100 Hours		% elongation in 3D	1000 Hours		%,elongation in 4D
		Ksi	Mpa		Ksi	Mpa
1000	538	99 Ksi	683 Mpa	3%	88 Ksi	607 Mpa	3%
1100 °F	593 °C	81.5 Ksi	562 Mpa	3%	71.5 Ksi	493 Mpa	3%
1200 °F	639 °C	61 Ksi	421 Mpa	5%	46 Ksi	317 Mpa	8.50%
1300 °F	704 °C	44.5 Ksi	307 Mpa	12%	29 Ksi	200 Mpa	30%
1350 °F	732 °C	35 Ksi	41 Mpa	29%	21 Ksi	145 Mpa	35%
1500 °F	816 °C	13 Ksi	90 Mpa	55%	7.7 Ksi	53 Mpa	–

 

Creep strength

Temperature		Stress MPa for creep of
°F	°C	0.5% in 100 hrs	1.0% in 100 hrs	0.5% in 1000 hrs	1.0% in 1000 hrs
1000	538	558	634	538	586
1100	593	524	552	469	483
1200	649	365	414	241	283
1300	704	207	245	/	/

 

V-notch charpy impact strength

Temperature		ft-lb	J
°F	°C
-310	-190	57.0	77.3
-100	-73	68.0	92.2
70	21	64.0	86.8
400	204	59.0	80.0
800	427	51.5	69.8
1000	538	45.5	61.7
1100	593	44.0	59.7
1200	649	35.0	47.5
1300	704	44.0	59.7

 

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

Minimum Order Quantity	2 metric tons
Price	negotiable
Packaging Details	water prevent, seaworthy transport, non-fumigation wooden box or pallet
Mark	As per order
Delivery Time	90-120 days
Payment Terms	T/T, L/C at sight, D/P
Supply Ability	1000 metric tons / Month