Stainless Steel E630
EN E630 · UNS W37410
E630 is a precipitation-hardening Cr-Ni-Cu stainless welding consumable (W37410; E630-16 per GB/T 983) that matches 17-4PH / Type 630 base metal and reproduces its aging response in the deposit.
Reference datasheet — E630 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
E630 tempers and conditions
E630 is supplied in 13 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
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 |
AWDefault 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?
E630 is a precipitation-hardening Cr-Ni-Cu stainless welding consumable (W37410; E630-16 per GB/T 983) that matches 17-4PH / Type 630 base metal and reproduces its aging response in the deposit. Engineers select it to weld and repair high-strength PH stainless components, using covered electrodes in the -15, -16, -17 and -26 coating classes with deposits usable in AW, Condition A or any of the H900 to H1150M aged states. Default aged deposit properties are about 760 MPa yield, 1010 MPa tensile, 10 % elongation and 33 HRC. Limits are service to roughly 300 °C, moderate corrosion resistance (52/100) and the need for a solution plus aging PWHT for full properties; where aging is impossible, an austenitic filler such as E309L is the usual substitute. E630 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). E630 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).
What is E630 used for?
- 17-4PH pump and valve components
- Aerospace structural brackets
- High-strength shafting repair
- Oil & gas PH stainless parts
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 properties
Typical room-temperature values for E630-AW; bars are the position among stainless steel grades.
Physical3
E630 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 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 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 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 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'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. 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. E630 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E630
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.
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 |
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.
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 E630 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W37410
- Trade names
- 17-4PH weld filler
- Also called
- AWS A5.4 E630-XX
How much does E630 cost?
E630 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.
E630 — frequently asked
What is E630 used for?
E630 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?
E630 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 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 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?
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 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?
E630 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.
How much does E630 cost?
E630 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 — 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; 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.