Stainless Steel E307
EN E307 · UNS W30710 · ASTM A5.4
E307 is a fully austenitic Cr-Ni-Mn covered electrode to AWS A5.4 (UNS W30710), carrying higher manganese and nickel than 308 for crack resistance in highly restrained or diluted joints; the same composition is also available as ER307 wire.
Reference datasheet — E307 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 AW condition
E307 tempers and conditions
E307 is supplied in 5 conditions, soft to hard. AW 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 |
|---|---|---|---|---|---|---|
Rutile-silica coated electrode, AC or DCEP | Higher silica coating giving the finest bead appearance and fluid slag; best for flat/horizontal cosmetic passes. | 425 | 625 | 38 | 198 HB | 2.2 % IACS |
Rutile (titania) coated electrode, AC or DCEP | Most widely stocked coating type: smooth arc, easy slag release, all-position, usable on AC transformers. | 430 | 630 | 37 | 200 HB | 2.2 % IACS |
AWDefault As-welded deposit | Standard condition for dissimilar-metal and buffer-layer joints; use as deposited without PWHT whenever the code permits. | 440 | 640 | 38 | 200 HB | 2.2 % IACS |
Lime/basic coated electrode, DCEP only | Choose for maximum weld-metal toughness and lowest hydrogen on thick, restrained dissimilar joints. | 450 | 645 | 40 | 200 HB | 2.2 % IACS |
Stress relieved | Condition after the joint receives a base-metal PWHT; expect slightly higher strength and lower ductility/toughness from carbide and σ-phase formation. | 460 | 655 | 32 | 210 HB | 2.3 % IACS |
Supply forms, finishes and certifications
Ways E307 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
ER307 | Solid GMAW/GTAW wire of the same composition | Supply option |
What is E307?
E307 is a fully austenitic Cr-Ni-Mn covered electrode to AWS A5.4 (UNS W30710), carrying higher manganese and nickel than 308 for crack resistance in highly restrained or diluted joints; the same composition is also available as ER307 wire. It is used for dissimilar-metal welds, manganese steel to stainless joints and as a buffer layer under hardfacing, with as-welded values near 440 MPa yield, 640 MPa tensile, 38% elongation and 200 HB (92 HRB). Corrosion resistance is moderate and below 308L or 316L, and the deposit work-hardens strongly. Use E309L where only a plain stainless-to-carbon-steel joint is required. E307 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F). E307 has a yield strength of 440 MPa (63.8 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 68% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 193 GPa (28 Msi).
What is E307 used for?
- dissimilar metal welding
- manganese steel to stainless joints
- hardfacing underlayers
- crack-sensitive joints
Advantages
- Readily welded — 92/100, better than 98% of stainless steel grades
Limitations
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
E307 properties
Typical room-temperature values for E307-AW; bars are the position among stainless steel grades.
Physical3
E307 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
E307 has a yield strength of 440 MPa (63.8 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 68% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
E307 is rated for continuous service to 700°C (1,292 °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 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
E307 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 58% of stainless steel grades.
Sustainability4
Producing a kilogram of E307 takes about 55 MJ of energy and emits 5.5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
E307's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability excellent (92/100); 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 stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. E307 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E307
Is E307 easy to machine?
Fully austenitic deposit work-hardens rapidly — use sharp carbide tools, positive rake, heavy feed and no dwell; grinding is often easier than turning.
Can E307 be welded?
Redry electrodes per maker (rutile ~150 °C, basic ~300 °C), keep interpass below ~150 °C, use short arc and stringer beads to limit dilution when joining stainless to carbon/high-Mn steel.
Can E307 be formed, bent or molded?
Not a wrought product; deposited metal is ductile (>30% elongation) and tolerates the strain of restrained joints and buffer layers.
E307 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 |
|---|---|---|
| CAWS A5.4 E307 | 0.04 – 0.14 | 0.09 |
| Cr | 18 – 21.5 | 19.5 |
| Ni | 9 – 10.7 | 9.8 |
| Mnhigh Mn suppresses hot cracking | 3.3 – 4.75 | 4 |
| Mo | 0.5 – 1.5 | 1 |
| Si | ≤ 0.9 | 0.6 |
| Cu | ≤ 0.75 | |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on E307?
Remove slag fully, then pickle/passivate or mechanically polish; heat tint must be removed to restore corrosion resistance.
Surface treatments FabDigit runs on stainless 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).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel E307 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W30710
- ASTM
- A5.4
How much does E307 cost?
E307 is a high-cost stainless 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.
E307 — frequently asked
What is E307 used for?
E307 is typically used for dissimilar metal welding, manganese steel to stainless joints, hardfacing underlayers and crack-sensitive joints. In short: most crack-resistant austenitic filler; dissimilar-joint workhorse; buffer layer for hardfacing.
What is the yield strength of E307?
E307 has a typical yield strength of 440 MPa (63.8 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 68% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is E307 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Fully austenitic deposit work-hardens rapidly — use sharp carbide tools, positive rake, heavy feed and no dwell; grinding is often easier than turning.
Can E307 be welded?
Yes — weldability is rated excellent (92/100). Redry electrodes per maker (rutile ~150 °C, basic ~300 °C), keep interpass below ~150 °C, use short arc and stringer beads to limit dilution when joining stainless to carbon/high-Mn steel.
What surface finishes work on E307?
Remove slag fully, then pickle/passivate or mechanically polish; heat tint must be removed to restore corrosion resistance.
Can E307 be formed, bent or molded?
Not a wrought product; deposited metal is ductile (>30% elongation) and tolerates the strain of restrained joints and buffer layers.
What is the maximum service temperature of E307?
E307 is rated for continuous use to about 700°C (1,292 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E307-AW and E307-SR?
AW is the default condition — standard condition for dissimilar-metal and buffer-layer joints; use as deposited without PWHT whenever the code permits. SR: condition after the joint receives a base-metal PWHT; expect slightly higher strength and lower ductility/toughness from carbide and σ-phase formation. Yield strength is 440 MPa in AW versus 460 MPa in SR.
How much does E307 cost?
E307 is a high-cost stainless 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
- AWS A5.4/A5.4M — Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding — American Welding Society (2012)
- AWS A5.9/A5.9M — Bare Stainless Steel Welding Electrodes and Rods — American Welding Society (2017)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- Stainless SMAW electrode datasheets (307 type) — Böhler Welding / Lincoln Electric / ESAB (2023)
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.