Steel S35C
JIS S35C
S35C is a Japanese medium-carbon machine-structural steel equivalent to SAE 1035, used for shafts, bolts and forged parts needing moderate strength.
Reference datasheet — S35C 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 N condition
S35C tempers and conditions
S35C is supplied in 8 conditions, soft to hard. N is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize Annealed | Spheroidized carbides for cold heading of bolts and cold extrusion blanks. | 270 | 480 | 33 | 140 HB | 10 % IACS |
Solution annealed | Softest condition — choose for deep machining, cold forming or before further heat treatment. | 280 | 500 | 30 | 143 HB | — |
Hot rolled | Cheapest stock form for non-critical shafts and weldments where machining allowance removes scale. | 300 | 550 | 22 | 160 HB | — |
NDefault Normalized | Standard stocked condition — uniform fine pearlitic structure with balanced strength, toughness and machinability. | 340 | 560 | 25 | 170 HB | — |
Quenched and tempered | Pick the water quenched and high-tempered condition (≈170–235 HB) for shafts and bolts needing 420 MPa yield with retained toughness and 22% elongation. | 420 | 640 | 22 | 13 HRC | — |
Induction hardened | Use where a wear-resistant, compressively stressed surface is needed on a tough shaft core. | 420 | 640 | 20 | 52 HRC | — |
Cold drawn | Pick for tight tolerance, smooth surface shafting used near as-supplied size with higher yield strength. | 530 | 620 | 12 | 185 HB | — |
Q&T to 25–30 HRC | Choose for higher-loaded shafts and gears in small sections where full hardenability of 0.35 %C is available. | 740 | 900 | 17 | 28 HRC | — |
What is S35C?
S35C is a Japanese medium-carbon machine-structural steel equivalent to SAE 1035, used for shafts, bolts and forged parts needing moderate strength. It is available hot-rolled, annealed, spheroidize-annealed, normalized and cold-drawn, plus quenched and tempered to about 25–30 HRC and induction hardened. Normalized values are 340 MPa yield, 560 MPa tensile and 25 % elongation at 170 HB, with a machinability score of 60, weldability 65 and formability 50. Welding needs preheat and low-hydrogen consumables above ~20 mm, cold bending is restricted, and there is no corrosion resistance; S30C is the more weldable alternative. S35C has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). S35C has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 76% of steel grades. Elongation at break is 25% and the elastic modulus is 205 GPa (29.7 Msi).
What is S35C used for?
- shafts
- bolts
- forged components
- gears
Advantages
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades
- High electrical conductivity — 10 % IACS, better than 83% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 82% of steel grades
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
S35C properties
Typical room-temperature values for S35C-N; bars are the position among steel grades.
Physical3
S35C has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical15
S35C has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 76% of steel grades. Elongation at break is 25% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
S35C is rated for continuous service to 400°C (752 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
S35C conducts electricity at 10 % IACS, better than 83% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of S35C takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability6
S35C's machinability is good (60/100, better than 83% of steel grades); weldability good (65/100); formability fair (50/100).
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 steel family
Yield strength against density for every steel grade FabDigit runs. S35C is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S35C
Is S35C easy to machine?
Machines readily at ~65 % of AISI 1212; normalized or 180–200 HB Q&T structure gives the best chip control, annealed material tends to smear.
Can S35C be welded?
Weldable by SMAW/GMAW with low-hydrogen consumables; preheat 100–200 °C above ~20 mm thickness and PWHT/slow cool to avoid HAZ martensite cracking.
Can S35C be formed, bent or molded?
Hot forges well at 1050–1200 °C; cold bending limited — use spheroidize-annealed stock for cold heading and allow generous bend radii.
S35C 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 |
|---|---|---|
| C | 0.32 – 0.38 | 0.35 |
| Si | 0.15 – 0.35 | 0.25 |
| Mn | 0.6 – 0.9 | 0.75 |
| P | ≤ 0.03 | |
| S | ≤ 0.04 | |
| Curesidual, max | ≤ 0.3 | |
| Niresidual, max | ≤ 0.2 | |
| Crresidual, max; Ni+Cr ≤ 0.35 | ≤ 0.2 | |
| Fe | balance |
What surface finishes work on S35C?
No corrosion resistance of its own — protect with phosphating, black oxide, zinc/Zn-Ni plating, hard chrome on shafts, or paint; takes a good polish up to a fine ground/lapped finish.
Surface treatments FabDigit runs on 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).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel S35C in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does S35C cost?
S35C is a budget-cost steel ($), cheaper than about 90% 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.
S35C — frequently asked
What is S35C used for?
S35C is typically used for shafts, bolts, forged components and gears. In short: forging-grade medium carbon; stronger than S30C; induction-hardenable shaft steel.
What is the yield strength of S35C?
S35C has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is S35C easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines readily at ~65 % of AISI 1212; normalized or 180–200 HB Q&T structure gives the best chip control, annealed material tends to smear.
Can S35C be welded?
Yes — weldability is rated good (65/100). Weldable by SMAW/GMAW with low-hydrogen consumables; preheat 100–200 °C above ~20 mm thickness and PWHT/slow cool to avoid HAZ martensite cracking.
What surface finishes work on S35C?
No corrosion resistance of its own — protect with phosphating, black oxide, zinc/Zn-Ni plating, hard chrome on shafts, or paint; takes a good polish up to a fine ground/lapped finish.
Can S35C be formed, bent or molded?
Hot forges well at 1050–1200 °C; cold bending limited — use spheroidize-annealed stock for cold heading and allow generous bend radii.
What is the maximum service temperature of S35C?
S35C is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S35C-N and S35C-CD?
N is the default condition — standard stocked condition — uniform fine pearlitic structure with balanced strength, toughness and machinability. CD: pick for tight tolerance, smooth surface shafting used near as-supplied size with higher yield strength. Yield strength is 340 MPa in N versus 530 MPa in CD.
How much does S35C cost?
S35C is a budget-cost steel ($), cheaper than about 90% 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
- JIS G 4051 — Carbon steels for machine structural use — JSA (2016)
- GB/T 699 — Quality carbon structural steels (35 ) — SAC (2015)
- SAE J403 / ASTM A29 — Carbon steel bars (1035) — SAE / ASTM (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.16 — Machining — ASM International (1989)
- Mysteel / SMM (2025)
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.