Steel SCr435
JIS SCr435
SCr435 is a higher-carbon JIS chromium quenched-and-tempered steel used for tougher, higher-strength shafts and gears than SCr430.
Reference datasheet — SCr435 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 QT condition
SCr435 tempers and conditions
SCr435 is supplied in 10 conditions, soft to hard. QT is the default FabDigit quotes; the values on this page are for it.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Pick for maximum machinability, cold forging or deep boring before hardening. | 350 | 600 | 25 | 197 HB | — |
Hot rolled | Cheapest mill condition for stock that will be re-heat-treated by the fabricator. | 420 | 700 | 20 | 207 HB | — |
Normalized | Uniform fine grain for forgings before final machining or hardening; moderate strength as-supplied. | 470 | 760 | 20 | 20 HRC | 8 % IACS |
Cold drawn | Use for close-tolerance, bright-finish shafting where no further heat treatment is planned. | 640 | 780 | 12 | 235 HB | — |
high-temper (tough) condition | Choose when toughness and machinability after heat treatment matter more than peak strength. | 750 | 900 | 19 | 27 HRC | 7.8 % IACS |
QTDefault Quenched and tempered | Standard commercial delivery condition: oil quench ~860 °C, temper 530–630 °C, for shafts, axles and bolts. | 830 | 980 | 17 | 31 HRC | — |
standard shafting hardness | Most common ordered hardness band for transmission shafts and connecting rods. | 830 | 980 | 17 | 30 HRC | 7.8 % IACS |
Induction hardened | Bearing journals and gear teeth needing a 50+ HRC wear surface over a tough tempered core. | 830 | 980 | 15 | 54 HRC | 7.5 % IACS |
higher-strength condition | For higher-loaded shafts and fasteners where some toughness may be traded for strength. | 950 | 1,100 | 15 | 34 HRC | — |
low-temper high-strength condition | Thin sections needing high strength and wear resistance; machine before hardening. | 1,150 | 1,300 | 12 | 40 HRC | — |
What is SCr435?
SCr435 is a higher-carbon JIS chromium quenched-and-tempered steel used for tougher, higher-strength shafts and gears than SCr430. The default Q&T condition gives about 830 MPa yield, 980 MPa tensile, 17 % elongation and 293 HB (31 HRC), with tempers on file from 25–30 HRC to 38–42 HRC plus induction hardening for local wear surfaces. Service is limited to about 400 °C, machinability drops to a score of 50, and weldability is restricted; the steel has no corrosion resistance and must be coated. SCM435 is the nearest alternative where molybdenum-assisted hardenability in larger sections is needed. SCr435 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). SCr435 has a yield strength of 830 MPa (120 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 87% of steel grades. Elongation at break is 17% and the elastic modulus is 206 GPa (29.9 Msi).
What is SCr435 used for?
- shafts
- gears
- bolts
Advantages
- High strength — 830 MPa (120 ksi), better than 87% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
SCr435 properties
Typical room-temperature values for SCr435-QT; bars are the position among steel grades.
Physical3
SCr435 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).
Mechanical16
SCr435 has a yield strength of 830 MPa (120 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 87% of steel grades. Elongation at break is 17% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
SCr435 is rated for continuous service to 400°C (752 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
SCr435 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of SCr435 takes about 30 MJ of energy and emits 2.1 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
SCr435's machinability is fair (50/100, worse than 53% of steel grades); weldability fair (40/100); formability fair (35/100).
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. SCr435 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with SCr435
Is SCr435 easy to machine?
Machine in the annealed or normalized state (≈55–65 % of AISI 1212); above 32 HRC use carbide with rigid setups and finish-grind after hardening.
Can SCr435 be welded?
Restricted weldability — preheat 200–300 °C, low-hydrogen consumables, and temper/stress-relieve at 550–650 °C immediately after welding to avoid HAZ cracking.
Can SCr435 be formed, bent or molded?
Hot forge 1100–1200 °C and cool slowly or normalize; cold heading and bending are practical only in the spheroidize-annealed condition.
SCr435 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 | 0.33 – 0.38 | 0.35 |
| Si | 0.15 – 0.35 | 0.25 |
| Mn | 0.6 – 0.85 | 0.72 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Cr | 0.9 – 1.2 | 1.05 |
| Niresidual, max | ≤ 0.25 | |
| Curesidual, max | ≤ 0.3 | |
| Fe | balance |
What surface finishes work on SCr435?
No natural corrosion protection — specify black oxide, phosphate + oil, zinc or hard-chrome plating; grind and polish easily for shaft seal surfaces.
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
How much does SCr435 cost?
SCr435 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.
SCr435 — frequently asked
What is SCr435 used for?
SCr435 is typically used for shafts, gears and bolts. In short: stronger than SCr430; wide Q&T hardness range; induction-hardenable shaft steel.
What is the yield strength of SCr435?
SCr435 has a typical yield strength of 830 MPa (120 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 87% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is SCr435 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machine in the annealed or normalized state (≈55–65 % of AISI 1212); above 32 HRC use carbide with rigid setups and finish-grind after hardening.
Can SCr435 be welded?
With care — weldability is rated fair (40/100). Restricted weldability — preheat 200–300 °C, low-hydrogen consumables, and temper/stress-relieve at 550–650 °C immediately after welding to avoid HAZ cracking.
What surface finishes work on SCr435?
No natural corrosion protection — specify black oxide, phosphate + oil, zinc or hard-chrome plating; grind and polish easily for shaft seal surfaces.
Can SCr435 be formed, bent or molded?
Hot forge 1100–1200 °C and cool slowly or normalize; cold heading and bending are practical only in the spheroidize-annealed condition.
What is the maximum service temperature of SCr435?
SCr435 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 SCr435-QT and SCr435-A?
QT is the default condition — standard commercial delivery condition: oil quench ~860 °C, temper 530–630 °C, for shafts, axles and bolts. A: pick for maximum machinability, cold forging or deep boring before hardening. Yield strength is 830 MPa in QT versus 350 MPa in A.
How much does SCr435 cost?
SCr435 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 4053 — Low-alloyed steels for machine structural use — JSA (2016)
- GB/T 3077 — Alloy structural steels (35Cr) — SAC (2015)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol. 4 — Heat Treating — ASM International (1991)
- Machinery's Handbook, 31st ed. — Industrial Press (2020)
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.