Stainless Steel 1.4578-C700
Supply condition
EN 1.4578
Light cold draw for straight, dimensionally accurate bar with moderate strength gain and retained bendability.
Values for the C700 condition
Other 1.4578 tempers and conditions
1.4578 is listed in 7 conditions; see the grade overview at 1.4578.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Default stock condition: maximum ductility for cold heading, deep drawing and multi-stage forming. | 235 | 540 | 45 | 150 HB | — |
soft annealed, lightly drawn / coated cold-heading quality wire | Pick for high-volume cold-headed fasteners: annealed wire with light sizing pass and forming lubricant/coating. | 280 | 570 | 40 | 165 HB | 2.3 % IACS |
C700This page cold drawn, tensile class 700 MPa min (≈1/4 hard) | Light cold draw for straight, dimensionally accurate bar with moderate strength gain and retained bendability. | 480 | 760 | 22 | 18 HRC | 2.3 % IACS |
cold drawn, tensile class 800 MPa min | Medium cold-drawn bar/wire for shafts and pins where 316-class corrosion plus higher proof strength is needed. | 600 | 860 | 16 | 24 HRC | 2.3 % IACS |
cold drawn, tensile class 900 MPa min (≈1/2 hard) | Choose when spring-back stiffness and higher load capacity matter more than further forming. | 700 | 950 | 12 | 28 HRC | 2.3 % IACS |
cold drawn, tensile class 1000 MPa min (≈3/4 hard) | Heavily drawn wire for high-strength fasteners, clips and springs in mildly corrosive service. | 830 | 1,060 | 10 | 31 HRC | 2.3 % IACS |
Full hard | Maximum-strength spring/clip wire; almost no further forming and reduced SCC margin. | 1,000 | 1,250 | 6 | 36 HRC | — |
What is 1.4578-C700?
1.4578-C700 is 1.4578 supplied in the C700 condition — light cold draw for straight, dimensionally accurate bar with moderate strength gain and retained bendability. 1.4578-C700 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 75% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 198 GPa (28.7 Msi). 1.4578-C700 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,385°C (2,525 °F). A is the default condition FabDigit quotes; C700 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Easy to machine — 47/100, better than 87% of stainless steel grades
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
- High strength — 480 MPa (69.6 ksi), better than 75% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
1.4578-C700 properties
Typical room-temperature values for 1.4578-C700; 24 are specific to this condition. Other listed values are 1.4578 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4578-C700 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical16
1.4578-C700 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 75% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 198 GPa (28.7 Msi).
Thermal6
1.4578-C700 is rated for continuous service to 300°C (572 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
1.4578-C700 conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 68% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4578-C700 takes about 55 MJ of energy and emits 5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4578-C700's machinability is fair (47/100, better than 87% of stainless steel grades); weldability good (65/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4578-C700
Is 1.4578 easy to machine?
Machines like 316L — gummy, work-hardening chips; use sharp positive-rake carbide, rigid setup, 60–110 m/min, heavy feed and flood coolant, avoid dwelling; Cu gives marginally better chip breaking than 1.4404.
Can 1.4578 be welded?
Weldable by TIG/MIG/resistance with 316L or 316LSi filler, no preheat, low heat input and fast cooling; the ~3 % Cu raises hot-cracking sensitivity so keep interpass temperature and dilution low and avoid heavy restraint.
Can 1.4578 be formed, bent or molded?
The reason to buy this grade: low work-hardening rate allows multi-stage cold heading, thread rolling and deep drawing with lower press loads; still needs good lubrication, chrome-free tooling coatings and interstage annealing only for extreme upsets.
What surface finishes work on 1.4578?
Passivate (ASTM A967 nitric/citric) or electropolish after forming to restore the chromium oxide; takes a bright mechanical polish, can be PVD-coated or blackened, but must not be anodised.
1.4578 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 |
|---|---|---|
| Clow-carbon for weld/corrosion stability | ≤ 0.04 | 0.03 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 2 | 1.3 |
| P | ≤ 0.05 | — |
| Slow S for cold-heading ductility | ≤ 0.02 | — |
| Cr | 16 – 18 | 17 |
| Niraised Ni stabilises austenite, lowers work hardening | 10 – 12 | 11 |
| Mopitting resistance (316-class) | 1.8 – 2.5 | 2 |
| Cukey addition for cold formability | 2.5 – 3.5 | 3 |
| Nkept low to limit work hardening | ≤ 0.11 | 0.04 |
| Fe | balance | — |
1.4578-C700 — frequently asked
What is 1.4578-C700 used for?
1.4578-C700 is typically used for cold-formed fasteners, hardware components and marine fittings. In short: cold-heading 316 variant; molybdenum corrosion with high formability; copper raises hot-cracking risk.
What is the yield strength of 1.4578-C700?
1.4578-C700 has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 75% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is 1.4578-C700 easy to machine?
Reasonably — machinability is rated fair (47/100, better than 87% of stainless steel grades). Machines like 316L — gummy, work-hardening chips; use sharp positive-rake carbide, rigid setup, 60–110 m/min, heavy feed and flood coolant, avoid dwelling; Cu gives marginally better chip breaking than 1.4404.
Can 1.4578-C700 be welded?
Yes — weldability is rated good (65/100). Weldable by TIG/MIG/resistance with 316L or 316LSi filler, no preheat, low heat input and fast cooling; the ~3 % Cu raises hot-cracking sensitivity so keep interpass temperature and dilution low and avoid heavy restraint.
What surface finishes work on 1.4578-C700?
Passivate (ASTM A967 nitric/citric) or electropolish after forming to restore the chromium oxide; takes a bright mechanical polish, can be PVD-coated or blackened, but must not be anodised.
Can 1.4578-C700 be formed, bent or molded?
The reason to buy this grade: low work-hardening rate allows multi-stage cold heading, thread rolling and deep drawing with lower press loads; still needs good lubrication, chrome-free tooling coatings and interstage annealing only for extreme upsets.
What is the maximum service temperature of 1.4578-C700?
1.4578-C700 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4578-A and 1.4578-FH?
A is the default condition — default stock condition: maximum ductility for cold heading, deep drawing and multi-stage forming. FH: maximum-strength spring/clip wire; almost no further forming and reduced SCC margin. Yield strength is 235 MPa in A versus 1,000 MPa in FH.
Sources
- EN 10088-3 Stainless steels — semi-finished products, bars, rods, wire, sections — CEN (2014)
- EN 10263-5 Steel rod, bars and wire for cold heading and cold extrusion — stainless steels — CEN (2017)
- EN 10088-1 Stainless steels — list of stainless steels (physical properties) — CEN (2014)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Cold-heading quality austenitic stainless wire (Cu-modified 316-type) datasheets — European stainless wire producers (2022)
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.