AWS Class ER630 MIG & TIG
ER630 (17-4 PH) MIG & TIG Welding Wire Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier, stockist and distributor of ER630 (17-4 PH) MIG and TIG welding wire per AWS A5.9 and ASME SFA 5.9, based in Mumbai, India.
ER630 is a precipitation‑hardening stainless steel filler metal. Its typical composition is about 16.5% chromium, 4.75% nickel, 3.5% copper, and 0.15-0.30% niobium, with carbon kept low at a maximum of 0.05%. The most important element is copper (3.25-4.00%). During age‑hardening at 480-620°C, copper forms very fine particles (epsilon‑Cu precipitates) that significantly strengthen the martensitic structure, allowing the metal to reach more than 1310 MPa tensile strength in the H900 condition. When a design needs both stainless steel corrosion resistance and very high tensile strength (above 1000 MPa or 145 ksi), ER630 provides a 17Cr‑4Ni‑4Cu‑Nb weld metal. This weld metal achieves its full strength only after proper age‑hardening heat treatment. ER630 welds can be heat‑treated from H900 (highest strength, 40–47 HRC) to H1150 (highest toughness, 28–35 HRC). Preheating isn’t needed, and it is used mainly on 17‑4PH (Type 630), 15‑5PH, and CB‑7Cu stainless castings.
As a trader and importer, Nicorex Alloys stocks select diameters of ER630 TIG rods and MIG spools for aerospace, nuclear, food processing, defence and petrochemical sectors across India. Every shipment includes EN 10204/3.1B mill test certificates.
ER630 (17-4 PH) Welding Wire Specifications
ER630 welding wire specifications covering classification, shielding gas, diameters and more are listed below.
| AWS Classification | ER630 per AWS A5.9 |
|---|---|
| UNS Designation | S17480 |
| Werkstoff Nr. | 1.4542 |
| Welding Processes | GTAW (TIG), GMAW (MIG), SAW |
| Polarity GTAW / GMAW | DCEN / DCEP |
| Positions | All |
| Shielding GTAW / GMAW | 100% Argon / Ar + 1–2% O₂ |
| TIG Rod Diameters | 1.6, 2.0, 2.4, 3.2 mm |
| MIG Wire Diameters | 0.9, 1.0, 1.2 mm |
AWS Classification Explained: What Does ER630 Mean?
The AWS classification of ER630 and its key identification details are summarised below according to AWS A5.9.
| Designation Element | Definition and Industry Context |
|---|---|
| ER | Electrode / Rod: indicates a bare solid welding wire |
| 630 | Alloy Type: matches AISI Type 630 wrought chemistry |
| (17-4 PH) | Precipitation hardening stainless steel with approx. 17% Chromium and 4% Nickel |
| (17-4 PH) | Precipitation hardening stainless steel with approx. 17% Chromium and 4% Nickel |
In the as-welded state, ER630 is a soft martensitic weld metal, about 30-35 HRC. Heating to 1040°C resets the structure. Ageing at 480-620°C forms fine copper particles that block dislocations and increase strength. H900 gives maximum strength, H1025 balances strength and toughness, and H1150 gives the highest ductility. E630-16 is the matching SMAW electrode.
Weld Deposit Chemical Composition of ER630
ER630 weld deposit chemistry, as per AWS A5.9, along with typical values, is mentioned below.
| Material / Element | Carbon (C) | Chromium (Cr) | Nickel (Ni) | Copper (Cu) | Nb (Cb) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulphur (S) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AWS A5.9 Range | 0.05% max | 16.0–16.75% | 4.5–5.0% | 3.25–4.00% | 0.15–0.30% | 0.75% max | 0.25–0.75% | 0.75% max | 0.03% max | 0.03% max | Balance |
| Typical | 0.03% | 16.50% | 4.82% | 3.58% | 0.22% | — | 0.53% | 0.44% | <0.01% | <0.01% | Balance |
Copper (3.25-4.00%) forms tiny copper particles during ageing at 480-620°C, which increases strength. Niobium (0.15-0.30%) adds extra NbC particle strengthening and helps prevent delta-ferrite networks. Low carbon (max 0.05%) keeps the weld HAZ free from harmful carbide formation.
All-Weld-Metal Mechanical Properties of ER630
This table shows the typical mechanical properties of ER630 weld metal in the as-welded condition, including strength, ductility, and hardness, in both as-welded and post-weld heat-treated conditions.
| Property | Tensile strength | Yield strength (0.2%) | Elongation | Hardness (as-welded) | Hardness (after PWHT) |
|---|---|---|---|---|---|
| Value | 552 MPa (80,000 psi) | 303 MPa (44,000 psi) | 26% | ~35–40 HRC / ~340–390 HV | ~22–28 HRC / ~230–290 HV |
| Condition | After PWHT | After PWHT | After PWHT | As-welded | PWHT at 690 °C / 1 hr |
In the H900 condition, ER630 reaches about 1310 MPa (190 ksi), which is higher than any other stainless filler in AWS A5.9. Even without heat treatment, its strength of 860-960 MPa is already higher than most austenitic stainless filler metals.
Base Metal Compatibility for ER630
ER630 is purpose-built for the 17-4PH family. Compatible base metals and dissimilar joint fillers are listed below.
| Base Metal | ASTM Grades |
|---|---|
| 17-4PH (Type 630) | A564 Type 630, A705, A693 |
| 15-5PH (Type XM-12) | A564 Type XM-12 |
| 17-7PH | A564 Type 631 |
| CB-7Cu Castings | A747 CB-7Cu-1, CB-7Cu-2 |
| Joint | Filler | Notes |
|---|---|---|
| 17-4PH to Carbon Steel | ER309L or ER630 | ER309L eliminates PH complexity |
| 17-4PH to 304/316 | ER309L or ER308L | Austenitic filler is preferred at the dissimilar interface |
Recommended Welding Parameters for ER630 Filler Wire
Below are the recommended ER630 welding settings for GTAW and GMAW, including suitable current ranges and voltage levels.
GTAW (TIG): DCEN, 100% Argon:
| DiameterDiameter | Current (A)Current (A) | Voltage (V)Voltage (V) |
|---|---|---|
| 1.6 mm (1/16″)1.6 mm (1/16″) | 60–12060–120 | 11–1511–15 |
| 2.4 mm (3/32″)2.4 mm (3/32″) | 100–170100–170 | 12–1712–17 |
| 3.2 mm (1/8″)3.2 mm (1/8″) | 150–220150–220 | 13–1813–18 |
GMAW (MIG): DCEP, Ar + 1–2% O₂:
| Diameter | Current (A) | Voltage (V) |
|---|---|---|
| 0.9 mm Short Circuit | 60–130 | 17–21 |
| 1.2 mm Spray | 180–260 | 26–31 |
No preheating is needed. For structural parts, heat-treat the weld at 480-620°C to increase strength. After welding, passivate the joint to restore corrosion resistance. On tight-tolerance components, use stringer beads and backpurge the root with argon for best results.
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Industrial Welding Applications of ER630 (17-4 PH) TIG & MIG Wire
ER630 serves industries where stainless corrosion resistance must combine with tensile strengths above 1000 MPa.
- Aerospace: ER630 is used to weld and repair 17-4PH landing gear parts, actuator shafts, engine brackets, and fasteners where high strength (over 1000 MPa) and corrosion resistance are required.
- Nuclear: Used on 17-4PH and CB-7Cu parts such as reactor internals, fuel handling systems, and control rod drives.
- Food & Dairy Processing: used for 17-4PH mixer shafts, agitators, pump impellers and centrifuge parts
- Oil & Gas / Offshore: Specifies ER630 for 17-4PH valve stems, actuator shafts, pump components and wellhead hardware on offshore platforms and subsea equipment.
- Pulp & Paper: Deployed on 17-4PH refiner discs, pressure screen baskets, and centrifugal cleaner components
- Defence & Military: Chosen for weapon components, ordnance hardware, and military vehicle parts in 17-4PH that demand high strength and reliable field repair.
- Medical Devices: Applied to 17-4PH surgical instruments, orthopaedic implant tooling, and medical equipment parts.
- General High-Strength Fabrication: Ideal for applications where stainless steel must resist corrosion and also reach tensile strengths above 1000 MPa.
Storage and Handling of ER630 Welding Filler Wire
ER630 is a solid bare wire, so moisture absorption is not a concern. The main quality risk is surface contamination.
- Store in original sealed packaging, clean, dry environment, 15-30°C, <60% RH.
- Keep it separate from carbon steel and dirty tools. Mixing them reduces both corrosion resistance and the hardening response.
- Use clean gloves when handling. Use only stainless steel tools and never use carbon steel brushes.
- Keep TIG rods in sealed tubes.
- Protect MIG spools with covers and check the wire for any discolouration before use.
- Clean the base metal and filler with acetone or MEK within 25 mm of the joint.
- After welding, stainless steel passivation is used to restore corrosion resistance on the weld and heat-affected zone (HAZ).
- For matching SMAW electrodes, store them in heated rod ovens at 100-150°C after you open the sealed cans.
Available Forms, Diameters and Packaging of ER630 Wire
Below are the available ER630 wire forms, diameters, and packaging for GTAW, GMAW and SAW welding.
| Form | Diameters | Packaging |
|---|---|---|
| TIG Rod (GTAW) | 1.6, 2.0, 2.4, 3.2 mm | 915/1000 mm tubes, 5 kg packs |
| MIG Wire (GMAW) | 0.9, 1.0, 1.2 mm | 15 kg spools |
| SAW Wire | 1.6, 2.4 mm | Coils (25 kg) |
| SMAW Electrode (companion) | E630-16: 2.5, 3.2, 4.0 mm | Hermetically sealed cans (2.5, 5 kg) |
How to Order ER630 (17-4 PH) Welding Wire from Nicorex Alloys
Include the following details in your RFQ to place an order for ER360 (17-4 PH) welding wire from Nicorex Alloys:
- Wire/Electrode Type: GTAW/GMAW wire, AWS A5.9 ER630
- Size: (in mm for both spools/rods)
- Current Type: DCEN TIG, DCEP MIG
- Welding Position: Flat, horizontal, vertical, overhead
- Material Grade: 17-4 PH stainless, UNS S17400, ER630
- Quantity: (in kg; Spools or rod tubes)
- Standard: AWS A5.9 / ASME SFA-5.9
- Documentation: EN 10204 3.1 MTC, TPI reports
- Packaging: Spools, foil bags, rods, rigid tubes.
- Delivery Destination: Domestic or international
Frequently Asked Questions
Does ER630 require preheat before welding?
No. It’s very low carbon (0.05% max), produces soft as-welded martensite at 30-38 HRC, so it resists cold cracking better than ER410/ER410NiMo. Only thick or restrained joints may need 100-150°C preheat.
What are the different heat treatment conditions for ER630 weld deposits?
The ‘H’ number is the ageing temperature in °F. H900 (482°C, 1 hr) gives maximum strength at 1310+ MPa. H1025 (552°C, 4 hr) balances strength and toughness around 1000 MPa. H1150 (621°C, 4 hr) gives lower strength (860–965 MPa) but higher ductility.
Can ER630 be used in the as-welded condition without heat treatment?
Yes. In the as-welded state, it reaches 860-960 MPa, higher than any austenitic filler. Heat treatment is only required for very high-strength applications.
What is the difference between ER630 and ER410 welding wire?
ER410 (12.5% Cr, up to 0.12% C) gains hardness from carbon and peaks near 550 MPa. ER630 (16.5% Cr, 3.5% Cu, Nb) hardens by precipitation, reaches about 1310 MPa in H900, offers better corrosion resistance, and usually needs no preheat.
Is ER630 suitable for cryogenic service?
In H1150 condition, ER630 stays tough down to about -40°C to -60°C. Below this, it turns brittle.
Does Nicorex Alloys stock ER630 for immediate delivery in India?
Nicorex Alloys stocks select ER630 wire sizes along with AMS certificates and EN 10204 3.1 MTCs provided. Contact us for current stock and pricing.