Stainless Steel E630-AW (As-welded deposit)
Heat-treated state · default condition
EN E630 · UNS W37410
Default supply/test condition: use when the joint strength of the untreated martensitic deposit is sufficient and PWHT is impractical.
Values for the AW condition
Other E630 tempers and conditions
E630 is listed in 13 conditions; see the grade overview at E630.
Compare all 13 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Double overaged 760 °C + 621 °C | Softest, toughest condition — specified for sour service / NACE MR0175 type applications and maximum impact toughness. | 585 | 860 | 19 | 27 HRC | — |
High-recovery / iron-powder coated electrode | Higher-deposition coating for flat and horizontal position filling of heavy PH stainless sections. | 750 | 1,000 | 9 | 32 HRC | 2.2 % IACS |
Rutile-silica coating, AC or DCEP | Higher-silica variant of the -16 coating with finer ripple and easier flat/horizontal fillet operation. | 755 | 1,010 | 10 | 33 HRC | 2.2 % IACS |
AWDefaultThis page As-welded deposit | Default supply/test condition: use when the joint strength of the untreated martensitic deposit is sufficient and PWHT is impractical. | 760 | 1,010 | 10 | 33 HRC | — |
Solution annealed | Solution-annealed weld metal before aging — used as the intermediate step or when maximum ductility of the deposit is wanted. | 760 | 1,030 | 12 | 33 HRC | 2.2 % IACS |
Overaged 621 °C (1150 °F) for 4 h, maximum toughness | Standard qualification condition of AWS A5.4 E630 deposits — best toughness/SCC resistance at ~930 MPa minimum tensile. | 760 | 965 | 16 | 31 HRC | — |
Titania (rutile-lime) coating, AC or DCEP | Most commonly stocked coating type (GB/T 983 equivalent); smooth arc, easy slag removal, all-position welding on AC or DC+. | 760 | 1,010 | 10 | 33 HRC | 2.2 % IACS |
Lime (basic) coating, DCEP only | Basic-coated electrode for lowest hydrogen and best deposit toughness; DC electrode positive, all-position with tighter arc control. | 770 | 1,010 | 11 | 33 HRC | 2.2 % IACS |
Aged 593 °C (1100 °F) for 4 h | Intermediate over-aged temper between H1075 and H1150 for moderate strength with good toughness. | 860 | 965 | 14 | 32 HRC | 2.4 % IACS |
Aged 579 °C (1075 °F) for 4 h | Over-aged temper giving good ductility and better chloride SCC behaviour at ~1000 MPa strength. | 930 | 1,000 | 13 | 33 HRC | 2.3 % IACS |
Aged 552 °C (1025 °F) for 4 h | Balanced strength/toughness temper widely used for pump, valve and shaft weld repairs. | 1,000 | 1,070 | 12 | 35 HRC | — |
Aged 496 °C (925 °F) for 4 h | Slightly over-aged from peak: near-H900 strength with a small gain in toughness and SCC resistance. | 1,100 | 1,210 | 10 | 40 HRC | 2.2 % IACS |
Aged 482 °C (900 °F) for 1 h, peak hardness | Maximum strength and hardness condition; choose for high-load joints where toughness and SCC resistance are secondary. | 1,170 | 1,310 | 9 | 42 HRC | 18 W/m·K |
What is E630-AW?
E630-AW is E630 heat treated to AW — default supply/test condition: use when the joint strength of the untreated martensitic deposit is sufficient and PWHT is impractical. E630-AW has a yield strength of 760 MPa (110 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 94% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 196 GPa (28.4 Msi). E630-AW has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 57% of stainless steel grades. It melts at 1,404°C (2,559 °F).
Advantages
- High strength — 760 MPa (110 ksi), better than 94% of stainless steel grades
Limitations
- Limited ductility — 10%, worse than 98% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Low fracture toughness — 70 MPa·√m (63.7 ksi·√in), worse than 83% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
- Needs corrosion protection — 52/100, worse than 76% of stainless steel grades
E630-AW properties
Typical room-temperature values for E630-AW; 10 are specific to this condition. Other listed values are E630 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
E630-AW has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 57% of stainless steel grades. It melts at 1,404°C (2,559 °F).
Mechanical16
E630-AW has a yield strength of 760 MPa (110 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 94% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
E630-AW is rated for continuous service to 300°C (572 °F). It conducts heat at 17.8 W/m·K (10.3 BTU/hr·ft·°F), better than 72% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
E630-AW conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 76% of stainless steel grades.
Sustainability4
Producing a kilogram of E630-AW takes about 62 MJ of energy and emits 4.6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
E630-AW's machinability is fair (38/100, better than 63% of stainless steel grades); weldability good (65/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E630-AW
Is E630 easy to machine?
Machine the deposit in Condition A or after over-aging (H1075/H1150); use rigid setups, sharp carbide and positive rake — chips are gummy and work-hardening is pronounced above 35 HRC.
Can E630 be welded?
Weld with DCEP (or AC for -16/-17), 100–150 °C preheat and interpass below ~150 °C, low heat input and stringer beads; redry electrodes 300–350 °C / 1 h and apply the specified solution + aging PWHT for full properties.
Can E630 be formed, bent or molded?
Not applicable as a filler; the deposited martensitic metal is essentially non-formable cold — shape by machining or grinding.
What surface finishes work on E630?
Passivate (ASTM A967 nitric or citric) or electropolish after grinding; ferrous — no anodizing. Deposit responds well to mechanical polishing when aged and can be hard-chrome or nickel plated with bake-out for hydrogen relief.
E630 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 undiluted weld metal | ≤ 0.05 | 0.04 |
| Cr | 16 – 16.75 | 16.4 |
| Ni | 4.5 – 5 | 4.7 |
| Cuprecipitation hardener | 3.25 – 4 | 3.6 |
| Nb+Tacolumbium + tantalum | 0.15 – 0.3 | 0.22 |
| Mn | 0.25 – 0.75 | 0.5 |
| Si | ≤ 0.75 | 0.5 |
| Mo | ≤ 0.75 | 0.2 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance | — |
E630-AW — frequently asked
What is E630-AW used for?
E630-AW is typically used for 17-4PH pump and valve components, aerospace structural brackets, high-strength shafting repair and oil & gas PH stainless parts. In short: matches 17-4PH base metal; post-weld ageable deposit; highest-strength stainless filler.
What is the yield strength of E630-AW?
E630-AW has a typical yield strength of 760 MPa (110 ksi) and a tensile strength of 1,010 MPa (146 ksi) — stronger than 94% of stainless steel grades. Strength varies by condition: see the 13 listed tempers.
Is E630-AW easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% of stainless steel grades). Machine the deposit in Condition A or after over-aging (H1075/H1150); use rigid setups, sharp carbide and positive rake — chips are gummy and work-hardening is pronounced above 35 HRC.
Can E630-AW be welded?
Yes — weldability is rated good (65/100). Weld with DCEP (or AC for -16/-17), 100–150 °C preheat and interpass below ~150 °C, low heat input and stringer beads; redry electrodes 300–350 °C / 1 h and apply the specified solution + aging PWHT for full properties.
What surface finishes work on E630-AW?
Passivate (ASTM A967 nitric or citric) or electropolish after grinding; ferrous — no anodizing. Deposit responds well to mechanical polishing when aged and can be hard-chrome or nickel plated with bake-out for hydrogen relief.
Can E630-AW be formed, bent or molded?
Not applicable as a filler; the deposited martensitic metal is essentially non-formable cold — shape by machining or grinding.
What is the maximum service temperature of E630-AW?
E630-AW is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E630-AW and E630-H900?
AW is the default condition — default supply/test condition: use when the joint strength of the untreated martensitic deposit is sufficient and PWHT is impractical. H900: maximum strength and hardness condition; choose for high-load joints where toughness and SCC resistance are secondary. Yield strength is 760 MPa in AW versus 1,170 MPa in H900.
Sources
- AWS A5.4/A5.4M — Stainless Steel Electrodes for Shielded Metal Arc Welding — American Welding Society (2012)
- ASTM A564/A564M — Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars — ASTM (2019)
- 17-4 PH Stainless Steel Product Data Bulletin — AK Steel / Cleveland-Cliffs (2016)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- Stainless PH electrode / ER630 filler data — Böhler Welding / Metrode (2021)
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.