AWS Class E317LT1-1/T1-4 Flux Core

E317LT1-1/T1-4 Flux Core Wire: High-Molybdenum Stainless FCAW for Severe Corrosion Service

Nicorex Alloys is an ISO 9001 and ISO 14001 certified Mumbai-based supplier and stockist supplying E317LT1-1/T1-4 flux core wire to fabricators and EPC contractors across India. We supply E317LT1-1/T1-4 flux core wire, which is classified under AWS A5.22 / ASME SFA 5.22 (UNS W31735).

This gas-shielded, all-position, rutile-type flux-cored electrode is also known as 317L FCAW wire. E317LT1-1/T1-4 is the step-up solution, carrying 3–4% molybdenum for a meaningful pitting resistance advantage. The ‘L’ designates low carbon (≤0.04%), preventing sensitisation as-welded. This high-performance weld deposit features an 18–21% Cr and 3–4% Mo chemistry. Running on DCEP, it meets AWS A5.22 standards for 550 MPa tensile strength and is dual-certified for CO2 or Ar/CO2 shielding. Engineers designing sulphuric acid, sulphite pulp digesters, chemical tankers, and saline marine equipment have a unique challenge.

Available in 0.9 mm, 1.2 mm, and 1.6 mm on vacuum-sealed D200/D300 spools (5 kg, 12.5 kg, and 15 kg). It is designed for P-Number 8, Group 1 base metals like AISI 317 (S31700), 317L (S31703), and 316L. These materials are commonly needed for pitting resistance. The alloy used meets strict code requirements, including F-Number 6 and A-Number 8 criteria, and EN ISO 17633-A specifications. The pulp and paper, chemical processing, and pharmaceutical sectors use it extensively. Every order includes batch testing, an MTC 3.1 certificate per EN 10204 and traceability to ensure quality.

E317LT1-1/T1-4 Flux Core Wire: Full Technical Specifications

Refer to the table below for classification details, process data, current ranges, and packaging.

ASME SFA Specification	SFA-5.22 (ASME Section II Part C)
UNS Number	W31735
Welding Process	FCAW-G (Gas-Shielded Flux-Cored Arc Welding)
Flux System	Rutile-type (TiO₂-based); fast-freezing slag
Polarity	DCEP
Welding Positions	All: Flat, Horizontal, Vertical-Up, Overhead
Shielding Gas	T1-1 : 100% CO₂ at 12–20 L/min (25–40 cfh) T1-4 : 75–80% Ar/bal. CO₂ at 12–20 L/min
Diameters	0.9 mm (0.035″), 1.2 mm (0.045″), 1.6 mm (1/16 ″)
Spool Types & Weights	D200: 5 kg; D300/BS300: 12.5 kg, 15 kg — vacuum-sealed
CTWD	12–20 mm; optimum 15–19 mm
Transfer Mode	Rutile FCAW wires project globular metal transfer.
Deposition Rate	~1.5–3.2 kg/hr
Deposition Efficiency	~85–90%
Max Interpass Temp.	150°C (302°F)
Preheat	Not required for P-8 base metals
PWHT	Not recommended (sensitisation/sigma risk)
Shelf Life (sealed)	24 months from the manufacture date

AWS Classification of E317LT1-1/T1-4 Explained

The following table breaks down the technical classification for this high-performance flux-cored wire, highlighting its chemistry and versatility.

Classification	Meaning & Specification	Key Advantage
E	Electrode	Designed for Flux-Cored Arc Welding (FCAW).
317	18Cr–13Ni–3Mo	Higher molybdenum (3–4%) for superior pitting resistance.
L	Low Carbon (≤0.04%)	Prevents carbide buildup in high-heat zones.
T	Tubular Wire	Indicates a flux-cored construction.
1	All-Position	Can be used for flat, vertical, and overhead welding.
-1 / -4	Dual Shielding Gas	Operates on 100% CO2 or Argon/CO2 blends.

E317LT1-1/T1-4 is a flexible flux-cored wire that makes welding easier. The high molybdenum and low carbon content make it resistant to pitting and corrosion. The dual-gas classification means that it can work with both CO₂ and argon-mix shielding.

Weld Deposit Chemical Composition: per AWS A5.22

All values represent deposited weld metal per AWS A5.22. Actual chemistry varies with shielding gas, heat input, and dilution.

Element	Carbon (C)	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Manganese (Mn)	Silicon (Si)	Phosphorus (P)	Sulfur (S)	Copper (Cu)
AWS A5.22 Req. (%)	0.04 max	18.0–21.0	12.0–14.0	3.0–4.0	0.5–2.5	1.0 max	0.04 max	0.03 max	0.75 max
Typical Deposit (%) [Ar/CO₂]	0.02–0.03	19.0–20.5	12.5–13.5	3.2–3.8	1.5–2.0	0.5–0.8	≤0.025	≤0.018	≤0.15

With 3.0–4.0% molybdenum, this alloy has a PREN of 31.6, making it more corrosion-resistant than ordinary grades. Low carbon concentration avoids weld deterioration during production, and 4–10 FN balanced ferrite assures crack resistance.

All-Weld-Metal Mechanical Properties: E317LT1-1/T1-4

Tested on an all-weld-metal assembly per AWS A5.22, as-welded condition. PWHT is not recommended.

Property	Tensile Strength	Yield Strength (0.2%)	Elongation (50 mm)	Charpy V-Notch Impact	Ferrite Number	Hardness
AWS A5.22 Minimum	80 ksi (550 MPa) min	58 ksi (400 MPa) min	35% minimum	Not required*	Not specified	Not specified
Typical: Ar/CO₂, As-Welded	85–92 ksi (585–635 MPa)	62–70 ksi (430–480 MPa)	38–45%	Not specified	4–10 FN typical (WRC-1992)	~HRB 85–93

*AWS A5.22 does not mandate Charpy testing for this classification. Verify sub-zero toughness requirements with the welding engineer.

Base Metal Compatibility and P-Number Matrix

Under ASME Section IX, E317LT1-1/T1-4 carries F-Number 6 and A-Number 8. Qualified base metals: P-Number 8, Group 1 austenitic stainless steels (QW-432).

AISI Type	UNS	P-No. / Group	Notes
317	S31700	P-8 Grp 1	Standard 317; use 317L filler for corrosion service
317L	S31703	P-8 Grp 1	Primary base metal for this consumable
316L	S31603	P-8 Grp 1	Use E317LT1-1 where extra pitting resistance is required
316	S31600	P-8 Grp 1	Verify service requirement before specifying 317L filler
316H	S31609	P-8 Grp 1	Ambient-temp corrosion service only

Dissimilar: For P-1/P-8 joints, use E309LT1-1/T1-4. For P-8/P-5A joints, consult the welding engineer.
ASME Code Reference: SFA-5.22 | F-6 (QW-432) | A-8 (QW-442) | P-8 similar joints.

Recommended Welding Parameters of E317LT1-1/T1-4 Flux Core

Follow AWS A5.22 and manufacturer datasheets. Verify it against the project’s specific welding procedure specifications for full compliance.

Parameter	0.9 mm (0.035″)	1.2 mm (0.045″)	1.6 mm (1/16″)
Current — Flat/H	80–150 A	100–200 A	150–300 A
Current — Vert-Up	80–130 A	100–160 A	140–200 A
Current — Overhead	90–130 A	100–160 A	140–190 A
Arc Voltage (flat)	22–25 V	24–27 V	24–31 V
Voltage (positional)	21–23 V	22–26 V	22–26 V
Polarity	DCEP	DCEP	DCEP
Wire Feed Speed	~365 in/min	~450 in/min	~235–265 in/min
CTWD	13–16 mm	16–20 mm	18–22 mm
Gas Flow	12–16 L/min	12–16 L/min	14–20 L/min
Travel Speed (flat)	300–500 mm/min	250–450 mm/min	200–380 mm/min

Maintain an interpass temperature of 150°C for P-8 base metals and avoid preheating or post-weld heat treatments to avoid sensitisation. Heat treatment requires full solution annealing at 1050–1100°C, followed by a fast quench to maintain material integrity.

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Industrial Welding Applications of E317LT1-1/T1-4 Flux Core Wire

Five industries use E317LT1-1/T1-4 because its greater Mo deposit resists corrosion better than E316LT1-1.

In the pulp and paper industry, this wire is the standard for welding digesters and bleaching towers exposed to aggressive sulphurous acids.
For chemical processing plants, it ensures that butt welds and nozzle connections in sulphuric acid absorber towers maintain the same corrosion resistance as the base metal.
It is a necessary upgrade for brine pipework and chemical skids in marine and desalination plants, where seawater chlorides usually cause pitting.
For pharmaceutical manufacturing, the dual-gas classification helps meet strict surface cleanliness standards by eliminating debris and supporting mandatory passivation testing.
In textile dyeing operations, it provides a code-compliant deposit for vessels exposed to acidic dye baths, matching the durability of 317L stainless steel.

Storage, Handling and Moisture Control

Store vacuum-sealed spools at 15–30°C and ≤55% RH. In Mumbai during monsoon (June–September), humidity exceeds 80–90%, making controlled storage critical. Once opened, store in a sealed bag with silica gel; use within 7–14 days in high-humidity environments. Re-dry at 120–150°C for 1–2 hours if porosity is observed. Packaging: D200 (5 kg), D300/BS300 (12.5 kg, 15 kg). Shelf life: 24 months unopened.

How to Order E317LT1-1/T1-4 Flux Core Wire from Nicorex Alloys

Please provide the following 10 details to place an order for E317LT1-1/T1-4 Flux Core Wire

AWS Classification - E317LT1-1/T1-4 per AWS A5.22 / ASME SFA 5.22
Diameter - 1.2 mm or 1.6 mm
Quantity - Total weight in kg (e.g., 100 kg / 500 kg)
Spool Type & Weight - D300 15 kg spool
Shielding Gas - 100% CO₂ (T1-1) or 75% Ar / 25% CO₂ (T1-4)
Required Approvals - Specify if needed (e.g., None, ABS, DNV, BV, or LR)
Certificates - MTC 3.1 per EN 10204 and COC per AWS A5.22
Project / Application - Description of use (e.g., 317L pressure vessel, FCAW multi-pass)
API 582 Compliance - Specify if required or not required
Delivery Address - City, State, and Country

Frequently Asked Questions

What is the Price of E317LT1-1/T1-4 Flux-Cored Wire per Kg in India?

Diameter, spool weight, order quantity, and DNV, ABS, and BV approvals determine pricing. Based on LME nickel and molybdenum, E317LT1-1/T1-4 FCAW wires cost more than E308L and E316L. Please provide Nicorex Alloys with your specifications for an EN 10204 MTC 3.1 quote.

What is the Difference Between E317LT1-1/T1-4 and E316LT1-1/T1-4?

The primary difference is molybdenum: E317LT1-1 deposits 3.0–4.0% Mo versus E316LT1-1 at 2.0–3.0% Mo, yielding PREN ≈ 31–32 vs ≈ 27–28. Choose E317LT1-1 when the base metal is 317/317L, or service involves sulfuric acid or concentrated chlorides. E316LT1-1 is sufficient for moderate chloride and mild acid service.

What are the F-Number and A-Number for E317LT1-1/T1-4 per ASME Section IX?

F-Number 6 and A-Number 8 per ASME Section IX. F-6 covers all SFA-5.22 stainless FCAW electrodes (QW-432). A-8 covers Cr-Ni stainless deposits including Mo-bearing grades (QW-442). A WPS qualified with this consumable qualifies all F-6/A-8 electrodes within QW-253 essential variables.

Can E317LT1-1/T1-4 Be Used to Weld AISI 316L Stainless Steel?

Yes. Both 316L and 317L are P-8 Group 1. Use E317LT1-1 when a higher-Mo weld deposit is needed for improved pitting resistance.

What does the PREN of E317LT1-1/T1-4 Weld Metal Mean for Chloride Pitting Resistance?

PREN (%Cr + 3.3×%Mo) ranks chloride pitting resistance. E317LT1-1 deposit: PREN ≈ 31.6; E316LT1-1: 27.3. The 4-point advantage is significant in hot saltwater, chloride brines, and mixed acid/chloride solutions. Comparative PREN shows that concentration, temperature, and crevice geometry affect pitting.

Does Nicorex Alloys Supply E317LT1-1/T1-4 with DNV, ABS or Other Third-Party Approvals?

Yes. DNV, ABS, Bureau Veritas, and Lloyd’s Register certificates are available on request. Approvals are lot-specific: specify the required body at the RFQ stage. Confirm API 582 Bi compliance if petrochemical guidelines apply.

What Are the Storage Requirements for E317LT1-1/T1-4 in Humid Environments?

Store sealed spools at 15–30°C, ≤55% RH. Once opened, use within 7–14 days in high-humidity conditions (Mumbai monsoon). Keep in a sealed bag with desiccant. Re-dry at 120–150°C for 1–2 hours if porosity is observed.