1.4545 S15500 15-5pH Precipitation Hardening Stainless Steel Flat Bar for Aerospace ISO 9001

Product Description

Product Description

1.4545 (UNS S15500 / XM-12 / 15-5PH) Precipitation Hardening Stainless Steel Flat Bar

1. Introduction

1.4545, also known as UNS S15500, XM-12 and commercially as 15-5PH, is a martensitic precipitation-hardening (PH) stainless steel. FUSHUN METAL manufactures this grade as high-quality flat bars, combining roughly 15% chromium, 5% nickel and 4% copper with niobium additions. It was developed as an improved version of 17-4PH, delivering higher transverse toughness, better forgeability and corrosion resistance close to 304 stainless.

In the solution-annealed state (Condition A) the material is fully martensitic and can be strengthened by a single low-temperature aging treatment, gaining high strength with minimal distortion. FUSHUN METAL supplies 1.4545 flat bars to aerospace, oil and gas, medical, food processing, petrochemical, power generation and general engineering sectors where strength, toughness and corrosion resistance must work together.

FUSHUN METAL controls the whole route from electric-arc melting to final inspection, so every flat bar carries consistent chemistry, clean microstructure and full traceability under our ISO 9001 quality system. Corrosion resistance is comparable to 304 stainless in most atmospheric and mild chemical environments, making 1.4545 a reliable choice where ordinary austenitic grades lack strength and hardenable 400-series grades lack toughness.

2. Equivalent Grades and Standards

FUSHUN METAL rolls and stocks 1.4545 to all major international specifications, allowing buyers to cross-reference the grade by their local standard. The table below lists the direct equivalents FUSHUN uses for sourcing, rolling and mill certificates. FUSHUN can also issue dual-certified material that satisfies more than one standard in a single shipment, which simplifies procurement for global projects.

Standard System	Grade / Specification
ASTM	A564, A693, A705 (Type XM-12)
AMS	AMS 5659, AMS 5862, AMS 5826
EN	1.4545 (X5CrNiCuNb15-5)
DIN	X5CrNiCuNb15-5 (W-Nr 1.4545)
GOST	08Kh15N5D2T
JIS	SUS15-5PH (JIS G 4303)
GB (China)	05Cr15Ni5Cu4Nb (S51550)

3. Applications and Typical Parts

Because 1.4545 keeps good toughness in both longitudinal and transverse directions, FUSHUN METAL recommends it for safety-critical and fatigue-loaded parts. Its balanced strength-to-weight ratio and weldability also reduce total manufacturing cost compared with higher-alloy alternatives. Typical components by industry are listed below.

Aerospace: landing-gear components, helicopter rotor fittings, aircraft structural brackets, engine compressor sections, high-strength bolts and fasteners, turbine blades.

Oil and Gas: valve bodies and trim, pump shafts, wellhead components, downhole tools, high-pressure fasteners.

Medical and Biomedical: surgical instruments, dental tools, orthopedic device parts.

Food Processing: mixer shafts, conveyor components, sanitary fittings, cutting blades.

Petrochemical and Chemical: reactor internals, pump components, corrosion-resistant fittings, bolting.

Power Generation and Nuclear: turbine components, generator shafts, control-rod parts, waste-handling hardware.

General Engineering and Tooling: mold inserts, gears, hollow shafts, precision machine parts.

4. Supply, Delivery Condition and Surface Condition

FUSHUN METAL operates precision rolling and open-die forging lines, enabling wide size coverage for flat bars, round bars and strip. Standard supply ranges are listed below. Bars are cut to requested length, packed with anti-rust protection and exported in seaworthy wooden crates or bundles, with markings and tags confirming grade, heat number and condition for easy incoming inspection.

Rolled Round Bar: diameter 3 mm to 600 mm; length up to 6000 mm (longer on request).

Rolled Flat Bar: thickness 3 mm to 120 mm; width 10 mm to 600 mm; length up to 6000 mm.

Strip and Coil: thickness 0.1 mm to 6.0 mm; width 5 mm to 600 mm.

Forged Block and Flat: thickness up to 300 mm, supplied as cut blocks or machined blanks.

Delivery Condition: Condition A (solution annealed, soft, about 1040°C water quench) for in-house machining, or pre-aged H900 / H1025 / H1150 to reach target strength without further heat treatment by the customer.

Surface Condition: black hot-rolled skin, pickled, turned, peeled, ground, bright or polished, selected to match the machining allowance and corrosion requirement of the part.

5. Chemical Composition (ASTM A564 / A693, XM-12)

FUSHUN METAL melts 1.4545 in an electric-arc furnace followed by LF refining and vacuum degassing (EAF + LF + VD), with optional ESR or VAR for aerospace-clean quality. Each heat is verified by PMI (positive material identification) before rolling. Niobium refines the grain and limits harmful ferrite, while copper precipitates during aging to create the high strength that defines this precipitation-hardening grade.

Element	Min %	Max %
Carbon (C)	-	0.07
Silicon (Si)	-	1.00
Manganese (Mn)	-	1.00
Phosphorus (P)	-	0.040
Sulfur (S)	-	0.030
Chromium (Cr)	14.00	15.50
Nickel (Ni)	3.50	5.50
Copper (Cu)	2.50	4.50
Niobium + Tantalum (Nb+Ta)	0.15	0.45
Iron (Fe)	Balance

6. Mechanical Properties by Heat Treatment

Properties depend on the aging temperature. FUSHUN METAL heat-treats in calibrated furnaces with full recording, then issues mechanical test reports. Typical values for flat bar are shown below.

Condition	Tensile Rm (MPa)	Yield Rp0.2 (MPa)	Elong. A (%)	Hardness (HRC)
Condition A (solution ann.)	≥1000	≥860	≥12	28-33
H900 (482°C, 4h, AC)	≥1310	≥1170	≥10	40-47
H1025 (552°C, 4h, AC)	≥1070	≥1000	≥12	34-42
H1150 (593°C, 4h, AC)	≥930	≥725	≥16	28-37

H900 gives the highest strength for valve trim and fasteners; H1025 balances strength and toughness for general engineering; H1150 offers the best ductility and stress-corrosion resistance for sour or marine service. FUSHUN METAL advises the condition during inquiry so the flat bar arrives ready for final machining. The grade is intended for service up to about 315°C; prolonged exposure between 370°C and 480°C should be avoided when ambient-temperature toughness is critical.

7. FUSHUN METAL Quality Assurance

FUSHUN METAL is an ISO 9001 certified specialty steel supplier. Every 1.4545 flat bar is produced under a documented quality system covering melting, rolling, heat treatment and inspection. Ultrasonic testing, dimensional checks, PMI and mechanical testing are performed on each order, and mill test certificates are supplied with the material. For aerospace and nuclear contracts, FUSHUN METAL can apply ESR or VAR remelting and arrange third-party inspection to meet the strictest cleanliness and traceability rules.

With integrated production and strict process control, FUSHUN METAL delivers 1.4545 / XM-12 precipitation-hardening stainless steel flat bars that meet ASTM, AMS, EN and customer-specific requirements worldwide. Flexible order quantities, fast response and reliable export packing help buyers keep projects on schedule.

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