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Stainless Steel Custom 450 · precip hard

Stainless Steel Custom 450-H1050

Properties of the H1050 condition, compared with the other Custom 450 tempers.

Use when 145 ksi class strength with high toughness and good chloride resistance is wanted.

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What is Custom 450-H1050?

Custom 450-H1050 is Custom 450 in the H1050 condition — use when 145 ksi class strength with high toughness and good chloride resistance is wanted. Custom 450-H1050 has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 17% and the elastic modulus is 200 GPa (29 Msi). Custom 450-H1050 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 66% of stainless steel grades. It melts at 1,400°C (2,552 °F). H900 is the default condition FabDigit quotes; H1050 is available on request or by drawing note.

Advantages

  • High strength — 930 MPa (135 ksi), better than 98% of stainless steel grades

Limitations

  • Limited ductility — 17%, worse than 86% of stainless steel grades
  • Limited formability — 20/100, worse than 86% of stainless steel grades
  • Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 83% of stainless steel grades

Custom 450-H1050 properties

Typical room-temperature values for Custom 450-H1050 — 12 properties are specific to this condition; the rest are grade-level values shared by every Custom 450 temper. Each bar shows where the value sits among the stainless steel grades in FabDigit's library — further right is higher.

Physical3

Custom 450-H1050 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 66% of stainless steel grades. It melts at 1,400°C (2,552 °F).

Density7.75 g/cm³0.28 lb/in³
Melting Point (Solidus)1,400°C2,552 °F
Liquidus Temperature1,440°C2,624 °F

Mechanical16

Custom 450-H1050 has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 17% and the elastic modulus is 200 GPa (29 Msi).

Elastic (Young's) Modulus200 GPa29 Msi
Shear Modulus77 GPa11.2 Msi
Bulk Modulus160 GPa23.2 Msi
Poisson's Ratio0.29
Tensile Strength (Ultimate)1,000 MPa145 ksi
Yield Strength (0.2% offset)930 MPa135 ksi
Elongation at Break17%
Reduction in Area58%
Compressive Strength1,240 MPa180 ksi
Shear Strength790 MPa115 ksi
Fatigue Strength (Endurance Limit)470 MPa68.2 ksi
Fracture Toughness (K_IC)80 MPa·√m72.8 ksi·√in
Charpy V-Notch Impact (RT)78 J57.5 ft·lbf
Hardness, Brinell302 HB
Hardness, Rockwell C32 HRC
Hardness, Vickers318 HV

Thermal6

Custom 450-H1050 is rated for continuous service to 450°C (842 °F). It conducts heat at 15.9 W/m·K (9.19 BTU/hr·ft·°F), better than 56% of stainless steel grades. Thermal expansion is 10.6 µm/m·K (5.89 µin/in·°F).

Thermal Conductivity15.9 W/m·K9.2 BTU/hr·ft·°F
Specific Heat Capacity460 J/kg·K0.11 BTU/lb·°F
Thermal Expansion (CTE, 20–100 °C)10.6 µm/m·K5.9 µin/in·°F
Latent Heat of Fusion270 J/g116 BTU/lb
Max Service Temperature (continuous)450°C842 °F
Min Service Temperature-75°C-103 °F

Electrical3

Custom 450-H1050 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.

Electrical Conductivity2.2 % IACS
Electrical Resistivity8×10⁻⁷ Ω·m31.5 µΩ·in
Magnetic Responseferromagnetic

Chemical & Environmental3

Corrosion resistance is good (64/100), better than 53% of stainless steel grades.

Galvanic Potential (seawater, vs SCE)-0.25 V
Corrosion ResistanceGood64/100
Chemical Resistance SummaryGood resistance to atmospheric, mild chemical and marine environments; superior to 17-4PH in chlorides but still subject to pitting/crevice attack in stagnant seawater and to SCC risk at peak-aged hardness — use H1000 or above for chloride service; not for reducing acids (HCl, hot H2SO4).

Sustainability4

Producing a kilogram of Custom 450-H1050 takes about 57 MJ of energy and emits 4.6 kg of CO₂ — more than 61% of stainless steel grades. Typical recycled content is 40%.

Embodied Energy (primary production)57 MJ/kg24,506 BTU/lb
Embodied Carbon (primary production)4.6 kg CO₂/kg
Embodied Water130 L/kg15.6 gal/lb
Typical Recycled Content40%

Manufacturability7

Custom 450-H1050's machinability is poor (28/100, worse than 80% of stainless steel grades); weldability good (60/100); formability poor (20/100).

MachinabilityPoor28/100
Machinability Rating (AISI 1212 = 100 %)40%
WeldabilityGood60/100
Formability (cold)Poor20/100
Brazeability / SolderabilityFair45/100
PolishabilityVery good78/100
Anodizing Responsen/a — stainless steel is not anodized; use passivation per ASTM A967 or electropolishing

Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.

Other Custom 450 tempers and conditions

Custom 450 is also supplied in 7 other conditions. The full side-by-side table is on the Custom 450 overview.

Working with Custom 450-H1050

Is Custom 450 easy to machine?

Machine in Condition A or at H1050–H1150 with rigid setups, positive-rake carbide, heavy feeds and flood coolant; work-hardens and galls like 17-4PH, so avoid dwelling and light finishing passes.

Can Custom 450 be welded?

Readily GTAW/GMAW/EBW welded without preheat using matched or 630/17-4PH filler; re-solution treat and age for full properties, or age-only for near-parent strength — no post-weld cracking issue thanks to Nb stabilization.

Can Custom 450 be formed, bent or molded?

Cold form only in the annealed condition with generous radii and springback allowance; hot work 1150–1200 °C and finish above 950 °C, then solution treat before aging.

What surface finishes work on Custom 450?

Passivate per ASTM A967 (nitric or citric) after machining; takes a fine polish and can be electropolished, chrome- or nickel-plated — bake after plating to avoid hydrogen embrittlement at high hardness.

Custom 450 chemical composition (wt %)

Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.

ElementSpec limit (wt %)Nominal
C≤ 0.050.03
Mn≤ 10.4
Si≤ 10.4
P≤ 0.03—
S≤ 0.03—
Cr14 – 1615
Ni5 – 76
Mo0.5 – 10.75
Cuprincipal precipitation hardener1.25 – 1.751.5
Nb8 × C minimum (Cb stabilization)≈ 0.30.3
Febalance—

Custom 450-H1050 — frequently asked

What is Custom 450-H1050 used for?

Custom 450-H1050 is typically used for aerospace landing gear components, hydraulic shafts and rods, pump and valve shafts, pulp and paper machine parts, marine fasteners and fittings and chemical process shafting. In short: tough custom PH stainless.

What is the yield strength of Custom 450-H1050?

Custom 450-H1050 has a typical yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 8 listed tempers.

Is Custom 450-H1050 easy to machine?

Not especially — machinability is rated poor (28/100, worse than 80% of stainless steel grades). Machine in Condition A or at H1050–H1150 with rigid setups, positive-rake carbide, heavy feeds and flood coolant; work-hardens and galls like 17-4PH, so avoid dwelling and light finishing passes.

Can Custom 450-H1050 be welded?

Yes — weldability is rated good (60/100). Readily GTAW/GMAW/EBW welded without preheat using matched or 630/17-4PH filler; re-solution treat and age for full properties, or age-only for near-parent strength — no post-weld cracking issue thanks to Nb stabilization.

What surface finishes work on Custom 450-H1050?

Passivate per ASTM A967 (nitric or citric) after machining; takes a fine polish and can be electropolished, chrome- or nickel-plated — bake after plating to avoid hydrogen embrittlement at high hardness.

Can Custom 450-H1050 be formed, bent or molded?

Cold form only in the annealed condition with generous radii and springback allowance; hot work 1150–1200 °C and finish above 950 °C, then solution treat before aging.

What is the maximum service temperature of Custom 450-H1050?

Custom 450-H1050 is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.

What is the difference between Custom 450-H900 and Custom 450-H1150?

H900 is the default condition — pick for maximum strength and hardness where chloride SCC risk is low. H1150: lowest-strength aged temper: highest ductility/toughness and best resistance to chloride SCC. Yield strength is 1,205 MPa in H900 versus 725 MPa in H1150.

Can FabDigit make parts in Custom 450-H1050?

Yes — Custom 450-H1050 is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.

Sources

  1. ASTM A564/A564M — Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes (Type XM-25) — ASTM International (2019)
  2. ASTM A693 — Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip — ASTM International (2016)
  3. Custom 450 Stainless (UNS S45000) alloy datasheet — Carpenter Technology (2020)
  4. ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
  5. MMPDS-16 — Precipitation-hardening stainless steels — Battelle/FAA (2021)

Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.