Stainless Steel E630-17
Grade
EN E630 · UNS W37410
E630-17 = rutile-silica coating, AC or DCEP
Higher-silica variant of the -16 coating with finer ripple and easier flat/horizontal fillet operation.
Values for the E630-17 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 |
E630-17This page 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 E630-17?
E630-17 is E630 in the E630-17 grade — higher-silica variant of the -16 coating with finer ripple and easier flat/horizontal fillet operation. E630-17 has a yield strength of 755 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). E630-17 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). AW is the default condition FabDigit quotes; E630-17 is available on request or by drawing note.
Advantages
- High strength — 755 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 — 68 MPa·√m (61.9 ksi·√in), worse than 85% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
E630-17 properties
Typical room-temperature values for E630-17; 22 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
E630-17 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
E630-17 has a yield strength of 755 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
E630-17 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
E630-17 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (54/100), worse than 75% of stainless steel grades.
Sustainability4
Producing a kilogram of E630-17 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
E630-17's machinability is fair (38/100, better than 63% of stainless steel grades); weldability good (66/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E630-17
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 | — |
E630-17 — frequently asked
What is E630-17 used for?
E630-17 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 E630-17?
E630-17 has a typical yield strength of 755 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 E630-17 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 E630-17 be welded?
Yes — weldability is rated good (66/100). 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 E630-17?
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 E630-17 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 E630-17?
E630-17 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.