XM-16 Precipitation Hardening Bar

Precipitation Hardening Stainless Steel Shafts

XM-16 Stainless Steel Bar AISI XM-16 | UNS S45500

Demanding shaft and precision component applications often require very high strength and hardness while still maintaining usable toughness. XM-16 precipitation hardening stainless steel achieves its final performance through controlled heat treatment, with different aging conditions producing different strength and hardness levels.

In the H900 condition, aged at approximately 482°C, XM-16 can reach very high tensile strength while maintaining sufficient toughness for demanding mechanical applications. Its corrosion resistance is better than many standard martensitic stainless steels, making it useful where strength, hardness, and moderate corrosion resistance must be combined in the same component.

Because its corrosion resistance may be lower than austenitic stainless steel grades such as 304 or 316 in strong acid or chloride-containing environments, XM-16 is best suited for applications where mechanical performance is the primary requirement and corrosion exposure is moderate. Compass Power Tech manufactures XM-16 precipitation hardening stainless steel precision ground bars for high-strength shafts, precision mechanical parts, load-bearing components, and applications requiring stable dimensions after heat treatment.

Mechanical Properties

Condition	Tensile strength (Rm)	Yield strength (Rp)	Elongation (A)	Reduction of area (Z)	Hardness
Cond A	-	-	-	-	≤ 331 HBW, ≤ 36 HRC
Cond H900	≥ 1620 MPa	≥ 1515 MPa	≥ 8%	≥ 30%	≥ 444 HBW, ≥ 47 HRC
Cond H950	≥ 1515 MPa	≥ 1415 MPa	≥ 10%	≥ 40%	≥ 415 HBW, ≥ 44 HRC
Cond H1000	≥ 1415 MPa	≥ 1275 MPa	≥ 10%	≥ 40%	≥ 363 HBW, ≥ 40 HRC

Chemical Composition (%)

Grade	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Ti	Nb
XM-16 (S45500)	≤ 0.03	≤ 0.50	≤ 0.50	≤ 0.015	≤ 0.015	11.00–12.50	7.50–9.50	1.50–2.50	≤ 0.50	0.80–1.40	0.10–0.50

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.

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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.