Steel 1330 · supply condition · default condition
Steel 1330-HR
Properties of the HR condition, compared with the other 1330 tempers.
Cheapest stock condition for parts that will be machined and then heat treated by the fabricator.
What is 1330-HR?
1330-HR is 1330 supplied in the HR condition — cheapest stock condition for parts that will be machined and then heat treated by the fabricator. 1330-HR has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of steel grades. Elongation at break is 20% and the elastic modulus is 205 GPa (29.7 Msi). 1330-HR 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).
1330-HR properties
Typical room-temperature values for 1330-HR — 8 properties are specific to this condition; the rest are grade-level values shared by every 1330 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
1330-HR 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).
Mechanical13
1330-HR has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of steel grades. Elongation at break is 20% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
1330-HR 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
1330-HR conducts electricity at 7.8 % IACS, worse than 58% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of 1330-HR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
1330-HR's machinability is good (58/100, better than 75% of steel grades); weldability fair (45/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 1330 tempers and conditions
1330 is also supplied in 8 other conditions. The full side-by-side table is on the 1330 overview.
- HRDefaultCheapest stock condition for parts that will be machined and then heat treated by the fabricator.415 MPa yield · 197 HB
- Q&T 40-45 HRCMaximum practical strength level for 1330; wear-and-strength parts where notch toughness is secondary.1,315 MPa yield · 43 HRC
- Q&T 33-38 HRCPick the ~425 °C temper at 33–38 HRC for heavily loaded bolts, pins and gear blanks requiring about 1145 MPa tensile strength; ductility and machinability fall against the higher temper.1,085 MPa yield · 36 HRC
- Q&TChoose quenched and tempered near 540 °C (≈26–30 HRC) as the general-purpose condition for shafts and bolts needing about 900 MPa tensile strength with good toughness and 18% elongation.830 MPa yield · 27 HRC
- CRPick for close tolerance, bright finish and higher as-supplied strength on shafting and fastener stock.690 MPa yield · 235 HB
- Cold FinishedCold-drawn/turned-ground-polished 1330 Mn-alloy bar: ~10–20 % strength gain over hot rolled with tight size tolerance and good machined finish, but reduced ductility and residual stress.585 MPa yield · 202 HB
- NormalizedUniform fine grain and good toughness without quenching distortion; typical pre-machining condition for forgings.560 MPa yield · 23 HRC
- AnnealedSoftest, most machinable and most formable condition; use before cold forming or deep machining.470 MPa yield · 207 HB
Working with 1330-HR
Is 1330 easy to machine?
Machines like a medium-carbon steel at ~60% of 1212; best in annealed/normalized state with rigid setups, carbide tooling and copious coolant — the high Mn makes chips gummy and work-hardening prone above 300 HB.
Can 1330 be welded?
Weldable with low-hydrogen electrodes but C≈0.30 plus 1.75 Mn gives high hardenability: preheat 200–300 °C, control interpass, and stress-relieve or re-temper after welding; avoid welding in the fully hardened condition.
Can 1330 be formed, bent or molded?
Hot forge 1100–1200 °C and finish above 900 °C, then normalize; cold bending only in annealed condition with generous bend radii (≥2.5 t).
What surface finishes work on 1330?
No natural corrosion protection — specify zinc or zinc-nickel plate (bake for hydrogen relief above 320 HB), manganese phosphate + oil, black oxide, or primer/paint; polishes to a good bright finish before plating.
1330 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 |
|---|---|---|
| CSAE J404 heat analysis | 0.28 – 0.33 | 0.3 |
| Mnprimary alloying element of 13xx series | 1.6 – 1.9 | 1.75 |
| Si | 0.15 – 0.35 | 0.25 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Fe | balance | — |
1330-HR — frequently asked
What is 1330-HR used for?
1330-HR is typically used for drive shafts, industrial gears and bolts. In short: workhorse Mn-Mo bar.
What is the yield strength of 1330-HR?
1330-HR has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of steel grades. Strength varies by condition: see the 9 listed tempers.
Is 1330-HR easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like a medium-carbon steel at ~60% of 1212; best in annealed/normalized state with rigid setups, carbide tooling and copious coolant — the high Mn makes chips gummy and work-hardening prone above 300 HB.
Can 1330-HR be welded?
With care — weldability is rated fair (45/100). Weldable with low-hydrogen electrodes but C≈0.30 plus 1.75 Mn gives high hardenability: preheat 200–300 °C, control interpass, and stress-relieve or re-temper after welding; avoid welding in the fully hardened condition.
What surface finishes work on 1330-HR?
No natural corrosion protection — specify zinc or zinc-nickel plate (bake for hydrogen relief above 320 HB), manganese phosphate + oil, black oxide, or primer/paint; polishes to a good bright finish before plating.
Can 1330-HR be formed, bent or molded?
Hot forge 1100–1200 °C and finish above 900 °C, then normalize; cold bending only in annealed condition with generous bend radii (≥2.5 t).
What is the maximum service temperature of 1330-HR?
1330-HR 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 1330-HR and 1330-CR?
HR is the default condition — cheapest stock condition for parts that will be machined and then heat treated by the fabricator. CR: pick for close tolerance, bright finish and higher as-supplied strength on shafting and fastener stock. Yield strength is 415 MPa in HR versus 690 MPa in CR.
Can FabDigit make parts in 1330-HR?
Yes — 1330-HR 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
- SAE J404 — Chemical Compositions of SAE Alloy Steels — SAE International (2021)
- ASTM A29/A29M — General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought — ASTM (2020)
- 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)
- GB/T 3077 (30Mn2 near-equivalent) — SAC / (2015)
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.