Stainless Steel A286 Round Bar
➡️ Alloy 660 | UNS S66286 | EN 1.4980
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Stainless Steel
UNS Number:
S66286
Wr. No.:
1.4980
MTC Available:
EN 10204 3.1
Product Description for Stainless Steel A286 Round Bar
A286 (UNS S66286) is an iron-based precipitation-hardening superalloy. Material is furnished to ASTM A453 Grade 660 for bolting applications, to ASTM A638 Grade 660 for general spring and fastener stock, and to AMS 5731, AMS 5732 and AMS 5737 for aerospace work.
The composition is roughly 25% nickel and 15% chromium in an iron matrix, with 1.90-2.35% titanium, 1.00-1.50% molybdenum, a vanadium addition and a controlled boron content of 0.001-0.010%. Strength comes from ageing, which precipitates a fine gamma prime phase based on nickel and titanium throughout the austenitic matrix.
What A286 offers is strength retention at temperature. It holds useful tensile and stress-rupture strength to around 700 C, well beyond anything a standard stainless grade manages, while remaining austenitic, essentially non-magnetic and considerably cheaper than a nickel-based superalloy.
Bar is solution treated at roughly 900-980 C depending on class, oil quenched, then aged at about 720 C for 16 hours. The solution temperature sets the balance between strength and stress-rupture ductility.
Machining is done before ageing where possible, since aged A286 is tough and work hardens rapidly.
The titanium content makes the alloy prone to strain-age cracking during welding, so components are usually machined from solid, and where welding is unavoidable it is done solution treated and followed by a full treatment and ageing cycle.
For aerospace and rotating parts, VIM plus VAR or ESR remelted material is normally specified with ultrasonic examination, since cleanliness governs fatigue life.
Available from 6 mm to 250 mm. Typical work is gas-turbine fasteners and casings, jet engine components, turbocharger wheels, high-temperature bolting, springs and non-magnetic hardware.
Common Applications of Stainless Steel A286 Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for A286 Round Bar
Standard
Country / Region
Grade
ASTM A453
USA
Grade 660 (UNS S66286)
ASTM A638 / A638M
USA
Grade 660
AMS 5737
USA
UNS S66286
EN 10269
Europe / EU
1.4980 (X6NiCrTiMoVB25-15-2)
BS EN 10269
United Kingdom
1.4980
JIS G4311
Japan
SUH 660
Technical Specification for Stainless Steel A286 Round Bar
Specification
Value
Unit
Material
Stainless steel
-
Grade
A286 / Grade 660 / UNS S66286 / 1.4980
-
Product Form
Round bar / rod
-
Standard
ASTM A453 Grade 660, ASTM A638 Grade 660, AMS 5731, AMS 5732, AMS 5737
-
Diameter
6 - 250 (typical supply range)
mm
Length
3 - 6 (random), or cut to length
m
Manufacturing Process
Hot rolled or forged, solution treated and age hardened
-
Production Route
EAF + AOD with VIM, VAR or ESR remelt for aerospace quality
-
Surface Finish
Hot-rolled and pickled, peeled, turned, centreless ground, polished
-
Heat Treatment / Delivery Condition
Solution treated 900-980 C, oil quenched, aged approximately 720 C for 16 hours
-
Tolerance Standard
ASTM A484 / A484M, or ASTM A29 / A29M where invoked
-
Density
7.94 (typical)
g/cm3
Melting Range
1370 - 1400 (typical)
C
Thermal Conductivity at 100 C
14.4 (typical)
W/m.K
Coefficient of Thermal Expansion (20-100 C)
16.4 (typical)
um/m.C
Specific Heat (0-100 C)
460 (typical)
J/kg.K
Electrical Resistivity at 20 C
0.91 (typical)
uOhm.m
Modulus of Elasticity at 20 C
201 (typical)
GPa
Magnetic Properties
Essentially non-magnetic, austenitic in all conditions
-
Maximum Service Temperature
700 (typical, continuous)
C
Testing / Inspection Standard
ASTM A370 for mechanical testing, ASTM E112 for grain size where specified
-
Certification / Inspection Documents
EN 10204 3.1 or 3.2 mill test certificate
-
Technical Specifications
Get the key technical specifications for Stainless Steel A286 Round Bar
Which standard applies depends on the application. ASTM A453 Grade 660 governs bolting for high-temperature pressure service and divides material into Classes A, B, C and D by solution treatment temperature and resulting property level. ASTM A638 Grade 660 covers general precipitation-hardening bar for springs and fasteners. Aerospace work goes to AMS 5731, AMS 5732 or AMS 5737, which differ in solution temperature and property requirements.
The solution treatment temperature is the variable that matters most. A lower solution treatment, around 900 C, gives higher room-temperature strength with finer grain. A higher one, around 980 C, coarsens the grain and produces better stress-rupture ductility and notch strength at temperature. Ageing then follows at roughly 720 C for 16 hours in both cases. Getting this wrong produces material that meets tensile requirements but fails in stress-rupture, so the class or AMS number belongs on the order.
Machining should be done in the solution-treated condition wherever the geometry allows, because aged material is tough and work hardens rapidly, and ageing causes only slight dimensional change.
For aerospace and rotating parts, VIM plus VAR or ESR remelted material is normally specified, together with ultrasonic examination and grain size control, since cleanliness governs fatigue life.
Chemical Composition for Stainless Steel A286 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.08
%
Manganese
Mn
-
2.00
%
Silicon
Si
-
1.00
%
Phosphorus
P
-
0.040
%
Sulfur
S
-
0.030
%
Chromium
Cr
13.50
16.00
%
Nickel
Ni
24.00
27.00
%
Molybdenum
Mo
1.00
1.50
%
Titanium
Ti
1.90
2.35
%
Vanadium
V
0.10
0.50
%
Aluminium
Al
-
0.35
%
Boron
B
0.001
0.010
%
Iron
Fe
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for A286 Round Bar
Titanium at 1.90-2.35% is the hardening element. During ageing it combines with nickel to precipitate a fine gamma prime phase distributed through the austenitic matrix, and that dispersion is what carries the strength. Titanium this high is also why the alloy is difficult to weld, since the phase can re-precipitate in the heat-affected zone and cause strain-age cracking.
Nickel at 24.00-27.00% serves two purposes. It holds the structure austenitic and non-magnetic across the full temperature range, and it supplies the other half of the gamma prime chemistry.
Chromium at 13.50-16.00% provides oxidation and general corrosion resistance, though at a lower level than a conventional stainless grade because the chromium content is modest by stainless standards.
Molybdenum at 1.00-1.50% strengthens the solid solution and helps the alloy resist softening during long exposure at temperature.
Boron at 0.001-0.010% looks trivial by weight but is not. It segregates to grain boundaries and markedly improves stress-rupture life and hot workability, and material outside that narrow band behaves noticeably worse.
Vanadium up to 0.50% adds solid-solution strength, aluminium is held low to control the precipitation chemistry, and carbon is capped at 0.08%.
Mechanical Properties for Stainless Steel A286 Round Bar
Mechanical Property
Value
Unit
Tensile Strength, solution treated and aged
895
MPa (minimum, ASTM A453 Grade 660)
Yield Strength 0.2% Proof, Classes A, B and C
585
MPa (minimum, ASTM A453 Grade 660)
Yield Strength 0.2% Proof, Class D
725
MPa (minimum, ASTM A453 Grade 660)
Elongation in 50 mm
15
% (minimum, all classes)
Reduction of Area
18
% (minimum, all classes)
Hardness
248 - 341
HB (specified range, ASTM A453 Grade 660)
Modulus of Elasticity
201
GPa (typical)
Mechanical Properties
Check the key mechanical properties and performance requirements of A286 Round Bar
The values shown are ASTM A453 Grade 660 requirements for solution-treated and aged bar, all minima except hardness, which is a specified range. Testing follows ASTM A370. Elongation and reduction of area are common to all four classes at 15% and 18% minimum. What separates them is proof strength: Classes A, B and C require 585 MPa minimum, while Class D requires 725 MPa. The class therefore has to be stated alongside any proof strength figure.
Room-temperature strength of 895 MPa tensile minimum alongside 585 MPa minimum proof is respectable but not remarkable. The reason to buy A286 is what happens above 500 C, where the gamma prime precipitate resists coarsening and the alloy retains a large share of its strength to around 700 C. Conventional austenitic stainless steels have lost most of theirs well before that point.
For sustained high-temperature service, design has to run on stress-rupture and creep data for the specific class rather than on room-temperature tensile values, since stress-rupture ductility varies significantly with solution treatment temperature.
The hardness range acts as a practical confirmation that solution treatment and ageing were both carried out correctly. Material outside it suggests a processing problem rather than a strong or weak heat.
Impact toughness is good and there is no ductile-to-brittle transition, since the structure stays austenitic throughout.
Dimension / Sizes for Stainless Steel A286 Round Bar
Dimension / Size
Value
Unit
Diameter
6 - 250
mm
Standard Length
3 - 6 (random / mill lengths)
m
Custom Length
Cut to length available on request
-
Diameter Tolerance
Per ASTM A484 / A484M, varies with size and finish class
-
Length Tolerance
Per ASTM A484 / A484M or as agreed at order
-
Straightness Tolerance
Per ASTM A484 / A484M or as agreed at order
-
End Condition
Square cut, chamfered, or as ordered
-
Surface Finish
Hot-rolled and pickled, peeled, turned, centreless ground, polished
-
Available Size Range
6 - 250, larger diameters by forging on enquiry
mm
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM A484 / A484M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for A286 Round Bar
Pricing for Stainless Steel A286 Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
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Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
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