XM-13 13-8PH Stainless Steel Bar

Precipitation Hardening Stainless Steel Shafts

XM-13 Stainless Steel Round Bar AISI XM-13 | UNS S13800

High-strength applications in aerospace, marine, nuclear, and petrochemical environments require materials that can combine strength, toughness, and resistance to stress corrosion. XM-13 (13-8PH) precipitation hardening stainless steel delivers high yield strength after aging treatment while maintaining good fracture toughness and resistance to stress corrosion in marine environments.

After aging at 535°C, XM-13 can achieve yield strength above 1240 MPa. In the H950 condition, tensile strength can reach ≥1310 MPa, making this material suitable for load-bearing precision components exposed to demanding mechanical conditions. It also offers good cold workability, and TIG welding can be performed without preheating.

Compass Power Tech manufactures XM-13 (13-8PH) stainless steel precision ground bars for aerospace fasteners, nuclear reactor components, petrochemical equipment, aircraft landing gear parts, injection molding equipment, cold-heading fasteners, and other precision components requiring high strength, stable dimensions, and reliable corrosion resistance.

Mechanical Properties

Product Form & Size (mm)	Test Direction	Condition	Tensile strength (Rm)	Yield strength (Rp)	Elongation (A)	Reduction of area (Z)	Hardness
Bar and Shapes		Cond A					≤ 363 HBW ≤ 38 HRC
Bar and Shapes, t ≤ 300	Longitudinal	Cond H950	≥1515 MPa	≥1415 MPa	≥10%	≥ 45%	≤ 430 HBW ≤ 45 HRC
Bar and Shapes, t ≤ 300	Longitudinal	Cond H1000	≥1415 MPa	≥1310 MPa	≥10%	≥ 50%	≤ 400 HBW ≤ 43 HRC
Bar and Shapes, t ≤ 300	Longitudinal	Cond H1025	≥1280 MPa	≥1210 MPa	≥11%	≥ 50%	≤ 380 HBW ≤ 41 HRC
Bar and Shapes, t ≤ 300	Longitudinal	Cond H1050	≥1210 MPa	≥1140 MPa	≥12%	≥ 50%	≤ 372 HBW ≤ 40 HRC
Bar and Shapes, t ≤ 300	Longitudinal, Transverse	Cond H1100	≥1035 MPa	≥930 MPa	≥14%	≥ 50%	≤ 313 HBW ≤ 34 HRC
Bar and Shapes, t ≤ 300	Longitudinal, Transverse	Cond H1150	≥930 MPa	≥620 MPa	≥14%	≥ 50%	≤ 283 HBW ≤ 30 HRC

Chemical Composition (%)

Grade	C	Si	Mn	P	S	Cr	Ni	Mo	N	Al
XM-13 (S13800)	≤ 0.05	≤ 0.10	≤ 0.20	≤ 0.010	≤ 0.008	12.3–13.2	7.50–8.50	2.00–3.00	≤ 0.01	0.90–1.35

Specifications

Diameter	Tolerance	Roundness	Straightness	Standard Length	Surface Roughness
Φ3-Φ25	0.1mm/m	g6, h6, f7	≤1/2	2m 3m	Ra≤0.4
Φ25-Φ40	0.1mm/m ≤	g6, h6, f7	≤1/2	3m, 6m	Ra≤0.4
Φ40-Φ80	0.1mm/m ≤	g6, h6, f7	≤1/2	3m, 6m	Ra≤0.4
Φ80-Φ150	≤0.05mm/m	g6, h6, f7	≤1/2	3m, 6m	Ra≤0.4
Φ150-Φ180	≤0.05mm/m	g6, h6, f7	≤1/2	3m, 6m	Ra≤0.4

Additional Custom Services

Cut-to-length service: Shaft length can be customized according to customer assembly requirements.
End chamfering: Both ends of the shaft can be chamfered to simplify downstream machining and installation.
Drawing-based machining: Shafts can be machined according to customer drawings and supplied as ready-to-assemble components.
Surface rolling treatment: Surface rolling can be applied to improve surface hardness when higher wear resistance is required.

Packaging and Storage

To protect stainless steel precision ground shafting during sea freight and storage, Compass Power Tech uses anti-rust paper tube packaging. Before wrapping, anti-rust oil is applied evenly to the shaft surface, and anti-rust wax is applied inside the paper tube. This protection process helps reduce corrosion risk during transportation and ensures customers receive shafts in stable, ready-to-use condition.

Looking for Custom Metal Components for Your Application?

We manufacture precision ground shafts, stainless steel tubing, piston rods and aluminum alloy cylinder tubes for hydraulic, pneumatic, machinery, energy and transportation applications. Contact us for material selection, specifications and customization support.