Steel 1J34
GB 1J34
1J34 is an Fe-Ni-Co soft magnetic alloy tuned for flat, field-independent permeability (constant-mu behaviour) rather than the highest peak permeability.
Reference datasheet — 1J34 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 M condition
1J34 tempers and conditions
1J34 is supplied in 5 conditions, soft to hard. M 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 |
|---|---|---|---|---|---|---|
Hot rolled / forged bar and rod, annealed | Order annealed hot rolled or forged bar for turned cores and magnetic shielding parts; 240 MPa yield and 32% elongation machine well, but finished parts still require a final magnetic anneal. | 240 | 540 | 32 | 125 HB | 3.8 % IACS |
MDefault Thermomechanically controlled processed | Standard delivery state: cold rolled strip given a hydrogen or vacuum magnetic anneal; form the part first, then run the final magnetic anneal to reach the specified constant-permeability band. | 260 | 560 | 30 | 130 HB | 3.8 % IACS |
Half-hard cold rolled strip | Choose half-hard cold rolled strip when parts need stiffness but must still be stamped; 620 MPa yield with 10% elongation, and magnetic properties come only from post-form annealing. | 620 | 750 | 10 | 200 HB | 3.8 % IACS |
Cold rolled then low-temperature stabilizing / field anneal | Use cold rolled strip given a long low-temperature (about 400–500 °C) stabilizing or magnetic-field anneal for linear inductors and magnetic modulators needing ageing-stable, constant permeability. | 760 | 880 | 6 | 22 HRC | 3.8 % IACS |
Hard cold rolled strip | Pick hard as-rolled strip when the high-reduction texture itself provides the constant-permeability effect: wound thin-strip cores, stiff parts, or work that cannot be annealed; 3% elongation. | 850 | 950 | 3 | 25 HRC | 3.7 % IACS |
What is 1J34?
1J34 is an Fe-Ni-Co soft magnetic alloy tuned for flat, field-independent permeability (constant-mu behaviour) rather than the highest peak permeability. It is chosen for wide-band linear inductors and low-distortion cores, and is supplied as strip, sheet, bar and wire in soft (M), Y2, Y, CR+MA and HR-ANN conditions, with typical annealed properties of 260 MPa yield, 560 MPa tensile, 30 % elongation and 130 HB. Magnetic performance depends entirely on the final magnetic anneal (hydrogen or vacuum, 1050–1150 °C with a specified cooling rate), so all cutting and forming must precede it. Service is limited to about 400 °C; where maximum permeability matters more than linearity, use 1J85. 1J34 has a density of 8.2 g/cm³ (0.296 lb/in³), heavier than 98% of steel grades. It melts at 1,440°C (2,624 °F). 1J34 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 92% of steel grades. Elongation at break is 30% and the elastic modulus is 185 GPa (26.8 Msi).
What is 1J34 used for?
- wide-band linear chokes
- loading coils
- distortion-sensitive transformer cores
Advantages
- Ductile — tolerates forming and impact — 30%, better than 93% of steel grades
- Good corrosion resistance — 25/100, better than 92% of steel grades
- Polishes to a fine finish — 70/100, better than 87% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
Limitations
- High embodied carbon — 11 kg CO₂/kg, worse than 100% of steel grades
- Poor heat conductor — 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 99% of steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 92% of steel grades
- Difficult to machine — 30/100, worse than 89% of steel grades
- Low electrical conductivity — 3.8 % IACS, worse than 84% of steel grades
1J34 properties
Typical room-temperature values for 1J34-M; bars are the position among steel grades.
Physical3
1J34 has a density of 8.2 g/cm³ (0.296 lb/in³), heavier than 98% of steel grades. It melts at 1,440°C (2,624 °F).
Mechanical15
1J34 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 92% of steel grades. Elongation at break is 30% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
1J34 is rated for continuous service to 400°C (752 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 99% of steel grades. Thermal expansion is 10 µm/m·K (5.56 µin/in·°F).
Electrical3
1J34 conducts electricity at 3.8 % IACS, worse than 84% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (25/100), better than 92% of steel grades.
Sustainability4
Producing a kilogram of 1J34 takes about 130 MJ of energy and emits 11 kg of CO₂ — more than 100% of steel grades. Typical recycled content is 25%.
Manufacturability8
1J34's machinability is poor (30/100, worse than 89% of steel grades); weldability good (55/100); formability very good (70/100).
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. 1J34 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1J34
Is 1J34 easy to machine?
The austenitic matrix work-hardens quickly and tends to smear on the tool, so use sharp positive-rake tooling, lower speeds with a heavier feed, and flood coolant. Leave only small finishing allowances to avoid a deep stressed layer that degrades magnetic properties.
Can 1J34 be welded?
TIG, micro-plasma and laser welding are all usable in a clean, sulfur-free and oil-free condition. A full magnetic anneal after welding is mandatory to restore constant permeability.
Can 1J34 be formed, bent or molded?
Soft-condition strip stamps, deep-draws and winds well (formability score 70). The amount of deformation sets the final constant-permeability level, so the forming route must be fixed and matched to the final anneal.
1J34 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 |
|---|---|---|
| Nigrade number denotes nominal nickel content | 33.5 – 35 | 34 |
| CoCo varies by producer/standard; confirm on mill certificate | 28 – 30 | 29 |
| Mn | 0.3 – 0.6 | 0.45 |
| Si | 0.15 – 0.3 | 0.2 |
| Clow carbon to ensure magnetic properties | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | |
| P | ≤ 0.02 | |
| Fe | balance |
What surface finishes work on 1J34?
Not anodizable; use nickel or tin plating, or a protective coating, for corrosion protection. Schedule the magnetic anneal (hydrogen or vacuum, 1050–1150 °C, controlled cooling rate) after all machining and deburring.
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 1J34 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Isoperm
How much does 1J34 cost?
1J34 is a high-cost steel ($$$$), pricier than about 78% 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.
1J34 — frequently asked
What is 1J34 used for?
1J34 is typically used for wide-band linear chokes, loading coils and distortion-sensitive transformer cores. In short: constant-permeability Fe-Ni-Co alloy; flat mu versus field; linear inductor core grade.
What is the yield strength of 1J34?
1J34 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 92% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1J34 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 89% of steel grades). The austenitic matrix work-hardens quickly and tends to smear on the tool, so use sharp positive-rake tooling, lower speeds with a heavier feed, and flood coolant. Leave only small finishing allowances to avoid a deep stressed layer that degrades magnetic properties.
Can 1J34 be welded?
Yes — weldability is rated good (55/100). TIG, micro-plasma and laser welding are all usable in a clean, sulfur-free and oil-free condition. A full magnetic anneal after welding is mandatory to restore constant permeability.
What surface finishes work on 1J34?
Not anodizable; use nickel or tin plating, or a protective coating, for corrosion protection. Schedule the magnetic anneal (hydrogen or vacuum, 1050–1150 °C, controlled cooling rate) after all machining and deburring.
Can 1J34 be formed, bent or molded?
Soft-condition strip stamps, deep-draws and winds well (formability score 70). The amount of deformation sets the final constant-permeability level, so the forming route must be fixed and matched to the final anneal.
What is the maximum service temperature of 1J34?
1J34 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 1J34-M and 1J34-Y?
M is the default condition — standard delivery state: cold rolled strip given a hydrogen or vacuum magnetic anneal; form the part first, then run the final magnetic anneal to reach the specified constant-permeability band. Y: pick hard as-rolled strip when the high-reduction texture itself provides the constant-permeability effect: wound thin-strip cores, stiff parts, or work that cannot be annealed; 3% elongation. Yield strength is 260 MPa in M versus 850 MPa in Y.
How much does 1J34 cost?
1J34 is a high-cost steel ($$$$), pricier than about 78% 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
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Soft Magnetic Fe-Ni-Co Alloys) — ASM International (1990)
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.