Brand: Selectarc

Selectarc UP P91 EB91 9Cr-1Mo Submerged Arc Wire

Name: Selectarc UP P91 EB91 SAW Wire – Datasheet & Price Quote
Brand: Selectarc
SKU: UP P91

Description

Matching SAW wire for grade 91 creep-resisting steel

The Selectarc UP P91 is a solid wire for submerged arc welding of 9% chromium – 1% molybdenum creep-resisting steels such as P91, for service temperatures up to 650 °C. It is classified AWS A5.23 EB91 and ISO 24598-A S S CrMo91. Microalloying with niobium, vanadium and nitrogen improves creep resistance, matching the modified 9Cr-1Mo design of the base metal.

Selectarc names the chemical and petrochemical industries as main users. Grade 91 is also standard in power plant steam piping and headers, and in refinery heater and hydroprocessing equipment where its strength at temperature allows thinner walls than older 2.25Cr-1Mo designs.

Technical specifications

Parameter	Specification
Manufacturer / product	Selectarc / UP P91
Process	SAW (submerged arc)
AWS classification	A5.23 EB91
ISO classification	24598-A S S CrMo91
Wire composition, min–max %	C 0.07–0.13, Si max 0.50, Mn 0.40–1.25, Cr 8.50–10.50, Ni 0.40–1.00, Mo 0.85–1.15, Cu max 0.10, Nb 0.03–0.10, V 0.15–0.25, N 0.03–0.07, Al max 0.04, P max 0.010, S max 0.010
Typical wire composition, %	C 0.10, Si 0.32, Mn 0.50, Cr 8.7, Ni 0.60, Mo 1.0, Nb 0.04, V 0.20, N 0.04
Parameters, 2.4 mm	200–400 A, 25–30 V, stick-out 18 mm, 40–60 cm/min
Parameters, 3.2 mm	300–500 A, 28–32 V, stick-out 20 mm, 40–60 cm/min
Parameters, 4.0 mm	500–700 A, 30–35 V, stick-out 22 mm, 50–60 cm/min
Current type	AC or DC electrode positive
Recommended flux	UP WP380
Maximum service temperature	650 °C

Base materials

Listed parent metals are EN X10CrMoVNb9-1 and the ASTM grades A182 / A336 F91 forgings, A213 T91 tube, A217 C12A castings, A234 WP91 fittings, A335 P91 pipe and A387 Gr 91 plate. The wire is therefore suitable for longitudinal and circumferential seams in thick-walled P91 pipe, headers and pressure vessels.

The data sheet gives a combined Mn + Ni limit, shown as A/T, of 0.50 max, and nickel itself is kept low. This matters because manganese and nickel lower the Ac1 transformation temperature; if Ac1 drops too far, the post-weld heat treatment can partly re-austenitise the weld and leave untempered martensite.

Preheat, interpass and PWHT for grade 91

Grade 91 welds are martensitic and need strict thermal control. General practice is a preheat in the region of 200 to 250 °C, an interpass maximum agreed in the WPS, cooling below the martensite finish temperature before PWHT, and tempering typically around 740 to 770 °C. These values come from codes and the qualified procedure, not from this wire data sheet, so always follow the approved WPS.

Hardness checks after PWHT confirm adequate tempering. Weld metal toughness of 9Cr-1Mo SAW deposits is sensitive to flux basicity and oxygen pick-up; Selectarc names UP WP380 as the partner flux. Keep flux dry, use clean wire, and avoid excessive heat input, which coarsens the structure and can lower impact energy.

Dissimilar joints between grade 91 and lower-alloy Cr-Mo or stainless components need special attention to carbon migration and to PWHT temperatures that suit both sides. Where such joints are unavoidable, the filler choice and heat treatment should be set by the welding engineer for that specific combination.

Documents and quotation

The Selectarc UP P91 data sheet is attached for download. Browse more wires in our SAW Wire category.

For a quotation, send wire diameter, packaging, quantity and certificate requirements.

Datasheets & Documents

Datasheet Selectarc UP P91 technical data sheet (EN) Download

Reviews (0)

Reviews

There are no reviews yet.

How would you rate this product?

About brand

Selectarc is a French manufacturer of welding and brazing filler metals, headquartered in Grandvillars, France. Its welding activity began in 1952 with Selectarc Industrie, a plant making covered electrodes, and the business is the welding and brazing division of the family group Viellard Migeon & Compagnie. In 2025 Framatome took a 40% stake in the company.

Selectarc welding and brazing products

The welding range covers covered electrodes for carbon, low-alloy, stainless and nickel-base steels, MIG and TIG wires, flux-cored wires and hardfacing products, with brazing alloys made at the former Reboud-Roche foundry. Selectarc lists the nuclear, defence and aerospace industries among its key markets, and welding production is concentrated at its Grandvillars site, which also houses the research laboratory.

Ordering Selectarc filler metals: what we need

Give the product name, for example Selectarc Ni625, and the AWS or ISO classification in your procedure, the diameter and length, and the quantity. Seven Star LLC, an independent supplier in Muscat, checks the grade against the Selectarc technical data sheet and can provide the data sheet and the certificates issued with the order on request.