Stainless Steel 13-8 Mo Round Bar
➡️ SS 13-8 Mo PH | UNS S13800 | EN 1.4534
➡️ 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:
S13800
Wr. No.:
1.4534
MTC Available:
EN 10204 3.1
Product Description for Stainless Steel 13-8 Mo Round Bar
In bar form, grade 13-8 Mo (UNS S13800, W.Nr. 1.4534) is supplied to ASTM A564 / A564M (Type XM-13). ASTM A484 / A484M sets the diameter, straightness and surface requirements. EN and GB/T list an equivalent grade. JIS and KS do not.
The grade is a martensitic precipitation-hardening stainless steel strengthened by aluminium rather than copper, with 12.25-13.25% chromium, 7.5-8.5% nickel, 2-2.5% molybdenum and 0.90-1.35% aluminium. Very tight limits on carbon, phosphorus, sulphur and nitrogen, combined with vacuum melting, give high transverse toughness and the highest strength of the common PH stainless grades.
Bar leaves the mill in the solution annealed (Condition A) or precipitation hardened (H950 to H1100) condition. Depending on the tolerance and surface a job needs, it can be hot finished, cold drawn, peeled, rough or smooth turned, centreless ground or polished. Diameters from 3 mm to 500 mm are usual, with larger sizes forged to order, in random 3 to 6 m lengths or cut to length. Strength is developed by a low-temperature precipitation-hardening (ageing) treatment carried out after machining.
Work done in this grade includes actuator shafts, downhole tools, structural fittings and highly loaded machined parts, mostly for the aerospace, defence, oil and gas, nuclear and precision engineering industries. An EN 10204 3.1 mill certificate covering heat analysis, mechanical test results and heat treatment condition is the normal documentation. The bar is ferromagnetic in every condition. Density is around 7.80 g/cm3 and the modulus of elasticity about 203 GPa. Third party inspection, positive material identification and non-destructive examination can be added at order stage.
Common Applications of Stainless Steel 13-8 Mo 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 SS 13-8 Mo PH Round Bar
Standard
Country / Region
Grade
ASTM A564 / A564M (Type XM-13)
USA
UNS S13800 - Type XM-13 (13-8 Mo)
ASME SA-564
USA
UNS S13800 - Type XM-13 (13-8 Mo)
EN 10088-3
Europe / EU
1.4534 (X3CrNiMoAl13-8-2)
BS EN 10088-3
United Kingdom
1.4534 (X3CrNiMoAl13-8-2)
JIS G4303
Japan
No equivalent grade listed in JIS G4303
GB/T 20878
China
05Cr13Ni8Mo2Al
KS D 3706
South Korea
No equivalent grade listed in KS D 3706
ISO 15510
International
X3CrNiMoAl13-8-2
Technical Specification for Stainless Steel 13-8 Mo Round Bar
Specification
Value
Unit
Material
Stainless Steel
-
Grade
13-8 Mo / UNS S13800 / W.Nr. 1.4534
-
Product Form
Round Bar / Rod
-
Standard
ASTM A564 / A564M (Type XM-13)
-
Diameter
3 - 500 (larger by forging on request)
mm
Length
3 - 6 (random mill length) or cut to length
m
Manufacturing Process
Hot rolled, forged or cold finished
-
Production Route
EAF + AOD / VOD refining, continuous cast or ingot, hot rolled or forged
-
Surface Finish
Hot-finished and pickled, cold-drawn, peeled, turned, ground or polished
-
Heat Treatment / Delivery Condition
Solution annealed (condition a) or precipitation hardened (h950 to h1100)
-
Tolerance Standard
ASTM A484 / A484M
-
Carbon Equivalent (CEV)
Not applicable (CEV applies to carbon and low-alloy steels)
-
Density
7.80 (nominal)
g/cm3
Melting Range
1400 - 1440 (typical)
C
Thermal Conductivity at 100 C
14.0 (typical)
W/m.K
Coefficient of Thermal Expansion (0-100 C)
10.6 (typical)
10-6/K
Specific Heat (0-100 C)
460 (typical)
J/kg.K
Electrical Resistivity at 20 C
1.02 (typical)
micro-ohm.m
Modulus of Elasticity at 20 C
203 (typical)
GPa
Magnetic Properties
Ferromagnetic in all conditions
-
Applicable Testing / Inspection Standard
ASTM A370 (mechanical testing), ASTM E18 / E10 (hardness)
-
Certification / Inspection Documents
EN 10204 3.1 mill test certificate standard, 3.2 third-party, PMI, ultrasonic and dye-penetrant examination available on request
-
Technical Specifications
Get the key technical specifications for Stainless Steel 13-8 Mo Round Bar
ASTM A564 / A564M (Type XM-13) is the usual ordering specification and ASTM A484 / A484M holds the tolerances. The European designation is 1.4534 (X3CrNiMoAl13-8-2). State the standard, the delivery condition and any supplementary testing when ordering.
Bar is supplied in Condition A, solution treated at approximately 925 C and cooled. Ageing at 510 C for four hours produces the H950 condition; higher ageing temperatures up to 590 C trade strength for toughness.
The route is either hot finishing, meaning rolling or forging with heat treatment and pickling, or cold finishing by drawing, peeling, turning or grinding. Size and finish class together decide the diameter, out of round, straightness and length tolerances.
The grade is normally double vacuum melted, using vacuum induction melting followed by vacuum arc remelting, which is why its cleanliness and fracture toughness exceed those of copper-hardened PH grades.
Physical property figures are typical producer data rather than standard requirements. Mechanical testing follows ASTM A370, and the certificate records analysis, test results, heat treatment and heat number. End condition, chamfering, marking and packing are settled at order stage along with the length tolerance.
Chemical Composition for Stainless Steel 13-8 Mo Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.05
%
Manganese
Mn
-
0.20
%
Silicon
Si
-
0.10
%
Phosphorus
P
-
0.010
%
Sulfur
S
-
0.008
%
Chromium
Cr
12.25
13.25
%
Nickel
Ni
7.50
8.50
%
Molybdenum
Mo
2.00
2.50
%
Aluminium
Al
0.90
1.35
%
Nitrogen
N
-
0.010
%
Chemical Composition
View the chemical composition and applicable material limits for SS 13-8 Mo PH Round Bar
Aluminium at 0.90-1.35% is the precipitation hardener, forming nickel-aluminium intermetallic precipitates during ageing. Molybdenum improves corrosion resistance and tempering stability, while very low carbon, phosphorus and sulphur maximise toughness.
Chromium runs 12.25 to 13.25% here, and it is what makes the steel stainless: it builds the passive oxide film that resists attack. Nickel at 7.50 to 8.50% stabilises the structure and improves ductility and toughness. The standard also fixes molybdenum 2.00 to 2.50%, aluminium 0.90 to 1.35%, nitrogen to 0.010% maximum. Carbon is capped at 0.05%.
Manganese and silicon are deoxidisers left over from melting and contribute modest solid solution strengthening. Phosphorus and sulphur are kept to low maxima, since both damage hot workability, weldability and corrosion resistance unless machinability is the priority.
The ASTM, EN, JIS, GB/T and KS versions are close but not identical. Compare the heat analysis on the mill certificate with the standard actually ordered before accepting the material for critical service. Chemical analysis is carried out to ASTM A751. Where the composition table shows no limit for an element, the standard sets no requirement and the element need not be determined or reported.
Mechanical Properties for Stainless Steel 13-8 Mo Round Bar
Mechanical Property
Value
Unit
Hardness (Condition A, solution annealed)
363 (max) / 38 HRC (max)
HBW
Tensile Strength (H950)
1520 (min)
MPa
Yield Strength 0.2% (H950)
1415 (min)
MPa
Elongation in 50 mm (H950, longitudinal)
10 (min)
%
Reduction of Area (H950, longitudinal)
45 (min)
%
Hardness (H950)
45 HRC / 430 HBW (min)
-
Tensile Strength (H1000)
1415 (min)
MPa
Yield Strength 0.2% (H1000)
1310 (min)
MPa
Hardness (H1000)
43 HRC / 400 HBW (min)
-
Tensile Strength (H1100)
1035 (min)
MPa
Yield Strength 0.2% (H1100)
930 (min)
MPa
Charpy V-Notch Impact (H1000, ASTM A564 Table 3)
27 (min)
J
Modulus of Elasticity
203 (typical)
GPa
Mechanical Properties
Check the key mechanical properties and performance requirements of SS 13-8 Mo PH Round Bar
In H950 the grade meets 1520 MPa minimum tensile strength, 1415 MPa minimum yield and 45 HRC, with 45% minimum reduction of area, which is high for material at this strength level.
The ageing condition governs the result. Age low and strength and hardness go up; age higher and strength drops while toughness, ductility and stress corrosion resistance improve. Tensile testing is to ASTM A370 and hardness to ASTM E18, certified for the condition ordered, so the condition has to be specified.
For design, use the specified minima of the standard and condition ordered and take the real numbers from the mill certificate. Section size matters too, since diameter affects cooling rate during heat treatment and how much hot or cold work the bar has seen.
This combination of very high strength with useful corrosion resistance and low distortion during hardening is why the grade is selected for highly loaded aerospace, subsea and rotating machinery components. Fatigue performance is good, but notch sensitivity rises with strength level, so higher ageing temperatures are often specified where impact or stress corrosion resistance matters more than peak strength.
Dimension / Sizes for Stainless Steel 13-8 Mo Round Bar
Dimension / Size
Value
Unit
Diameter (standard supply range)
3 - 500 (larger by forging on request)
mm
Standard Length
3 - 6 (random mill length)
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 on the order
-
Straightness Tolerance
Per ASTM A484 / A484M or as agreed on the order
-
End Condition
Square cut, saw cut, chamfered or as ordered
-
Surface Finish
Hot-finished and pickled, cold-drawn, peeled, turned, ground or polished
-
Available Size Range (cold-finished bar)
3 - 100 (typical commercial capability)
mm
Available Size Range (hot-finished and forged bar)
16 - 500 (typical commercial capability)
mm
Cut-to-Length Availability
Available, tolerance to be agreed at order stage
-
Applicable Dimensional Standard
ASTM A484 / A484M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for SS 13-8 Mo PH Round Bar
Pricing for Stainless Steel 13-8 Mo 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
Get current Stainless Steel 13-8 Mo Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
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
What is Stainless Steel 13-8 Mo Round Bar?
What standard does Stainless Steel 13-8 Mo Round Bar comply with?
What are the equivalent grades of Stainless Steel 13-8 Mo Round Bar?
What sizes and lengths are available in Stainless Steel 13-8 Mo Round Bar?
What are the key mechanical properties of Stainless Steel 13-8 Mo Round Bar?
What is the typical chemical composition of Stainless Steel 13-8 Mo Round Bar?
Can Stainless Steel 13-8 Mo Round Bar be supplied cut to length or with a specific surface finish?
How does 13-8 Mo compare with 17-4 PH round bar?
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