Stainless Steel 1.4008
EN 1.4008
1.4008 (GX7CrNiMo12-1, ASTM A743 Gr.
Reference datasheet — 1.4008 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the +QT1 condition
1.4008 tempers and conditions
1.4008 is supplied in 5 conditions, soft to hard. +QT1 is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose for maximum machinability of rough castings before final hardening and tempering. | 380 | 590 | 22 | 180 HB | — |
+QT1Default Quenched (≈ 950–1050 °C) and high-tempered (≈ 650–700 °C), Rp0.2 ≥ 440… | Standard delivery condition for pump casings, valve bodies and hydro parts — best balance of strength, toughness and corrosion resistance. | 500 | 690 | 18 | 18 HRC | — |
Quenched and tempered to Rp0.2 ≥ 550 MPa | Higher-strength condition for pressure-retaining valve bodies and stems where extra yield strength is specified. | 600 | 800 | 16 | 24 HRC | — |
As fabricated | Shipping/intermediate condition only — hard, brittle untempered martensite; must be austenitized and tempered before service. | 700 | 900 | 4 | 36 HRC | 2.8 % IACS |
Q&T high hardness | Pick for seating faces, wear rings and trim needing hardness and cavitation resistance; toughness and corrosion resistance are reduced and it is not sour-service compliant. | 950 | 1,150 | 8 | 40 HRC | — |
What is 1.4008?
1.4008 (GX7CrNiMo12-1, ASTM A743 Gr. CA15M, UNS J91151) is a European cast Cr-Ni-Mo martensitic stainless steel, the molybdenum-bearing member of the 12% Cr CA15 family. Pump casings and valve bodies are cast to shape then annealed or quenched-and-tempered to about 500 MPa yield, 690 MPa tensile, 18% elongation and 210 HB (18 HRC), with service to 600 °C. Machinability (42) and weldability (40) are limited: 200–300 °C preheat and a 600–650 °C post-weld temper are mandatory. Where weld repair and toughness dominate, low-carbon CA6NM (1.4317) is the nearer choice. 1.4008 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F). 1.4008 has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 77% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4008 used for?
- Pump casings
- Valve bodies
- General corrosion-resistant castings
Advantages
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
- High strength — 500 MPa (72.5 ksi), better than 77% of stainless steel grades
Limitations
- Limited formability — 10/100, worse than 95% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
- Limited ductility — 18%, worse than 83% of stainless steel grades
- Difficult to weld — 40/100, worse than 83% of stainless steel grades
- Low fracture toughness — 85 MPa·√m (77.4 ksi·√in), worse than 77% of stainless steel grades
1.4008 properties
Typical room-temperature values for 1.4008-+QT1; bars are the position among stainless steel grades.
Physical3
1.4008 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.4008 has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 77% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4008 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
1.4008 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4008 takes about 53 MJ of energy and emits 3.6 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4008's machinability is fair (42/100, better than 79% of stainless steel grades); weldability fair (40/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. 1.4008 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4008
Is 1.4008 easy to machine?
Machine in the annealed or high-tempered condition with rigid setups, sharp coated carbide, moderate speed (~80–120 m/min) and generous feed to avoid work-hardened glazing; rough-machine before final temper.
Can 1.4008 be welded?
Weldable with matched 410NiMo/E410NiMo or austenitic 309/316L consumables — preheat 200–300 °C, maintain interpass, and post-weld temper at 600–650 °C to restore toughness and avoid hydrogen cracking.
Can 1.4008 be formed, bent or molded?
Sand or investment cast; use adequate risering and controlled slow cooling from the mould to prevent quench cracking, then austenitize 950–1050 °C, air/oil quench and temper.
1.4008 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.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CASTM CA15M allows up to 0.15 % | 0.05 – 0.1 | 0.07 |
| Si | ≤ 0.8 | 0.5 |
| MnASTM CA15M allows 1.00 % max | ≤ 0.8 | 0.6 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| CrCA15M: 11.5–14.0 | 12 – 13.5 | 12.7 |
| NiCA15M limits Ni to 1.0 max — grades are similar but not identical | 1 – 2 | 1.5 |
| MoCA15M: 0.15–1.00 | 0.2 – 0.5 | 0.35 |
| Fe | balance |
What surface finishes work on 1.4008?
Passivate per ASTM A967 or electropolish after machining; takes a good mechanical polish and accepts hard chrome, nitriding or HVOF overlays on wear faces — no anodizing.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 1.4008 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX7CrNiMo12-1
- Similar grades
- A743 Gr. CA15MJ91151
How much does 1.4008 cost?
1.4008 is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1.4008 — frequently asked
What is 1.4008 used for?
1.4008 is typically used for pump casings, valve bodies and general corrosion-resistant castings. In short: mo-bearing CA15M equivalent; moderate corrosion and heat resistance; needs preheat and PWHT.
What is the yield strength of 1.4008?
1.4008 has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 77% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4008 easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% of stainless steel grades). Machine in the annealed or high-tempered condition with rigid setups, sharp coated carbide, moderate speed (~80–120 m/min) and generous feed to avoid work-hardened glazing; rough-machine before final temper.
Can 1.4008 be welded?
With care — weldability is rated fair (40/100). Weldable with matched 410NiMo/E410NiMo or austenitic 309/316L consumables — preheat 200–300 °C, maintain interpass, and post-weld temper at 600–650 °C to restore toughness and avoid hydrogen cracking.
What surface finishes work on 1.4008?
Passivate per ASTM A967 or electropolish after machining; takes a good mechanical polish and accepts hard chrome, nitriding or HVOF overlays on wear faces — no anodizing.
Can 1.4008 be formed, bent or molded?
Sand or investment cast; use adequate risering and controlled slow cooling from the mould to prevent quench cracking, then austenitize 950–1050 °C, air/oil quench and temper.
What is the maximum service temperature of 1.4008?
1.4008 is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4008 +QT1 and 1.4008 QT-HH?
+QT1 is the default condition — standard delivery condition for pump casings, valve bodies and hydro parts — best balance of strength, toughness and corrosion resistance. QT-HH: pick for seating faces, wear rings and trim needing hardness and cavitation resistance; toughness and corrosion resistance are reduced and it is not sour-service compliant. Yield strength is 500 MPa in +QT1 versus 950 MPa in QT-HH.
How much does 1.4008 cost?
1.4008 is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10283 — Corrosion resistant steel castings (GX7CrNiMo12-1 / 1.4008) — CEN (2010)
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- ASTM A743/A743M — Castings, Iron-Chromium, Iron-Chromium-Nickel (Gr. CA15M, UNS J91151) — ASTM (2021)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (cast martensitic stainless) — ASM International (1990)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.