BÖHLER FOX C 9 MV

BÖHLER FOX C 9 MV LNi Specifications and Typical Applications

BÖHLER FOX C 9 MV LNi is a basic-coated, alloy-cored stick electrode. The 9Cr-1Mo-VNb weld metal exhibits a fully tempered martensitic microstructure and possesses favorable mechanical properties after post-weld heat treatment.

Similar alloyed creep-resistant steels and castings:

Kimyasal bileşim, kaynak sonrası ısıl işlemden sonra yüksek sünme dayanımı ve süneklik sağlamak üzere optimize edilmiştir. İz element seviyesi düşüktür (Bruscato < 15). Mn + Ni içeriğinin %1,0 ağırlıkça altında sınırlandırılması sayesinde Ac1 sıcaklığı kesin olarak 780 °C’nin üzerindedir. Bazik örtüsü, kaynak metalinde düşük seviyede difüze olabilen hidrojen sağlar.

cast steels

Similar creep-resistant steels and castings made from similar alloys:

• 1.4903 X10CrMoVNb9-1
• 1.4955 GX12CrMoVNbN9-1
• ASTM Grade 91, T91, P91, F91, FP91, WP91, C12A
• 10Cr9Mo1VNbN
• STPA28, STBA28

BÖHLER FOX C 9 MV LNi Chemical Analysis

Mechanical Properties of BÖHLER FOX C 9 MV LNi Weld Metal – Typical Values (Minimum Values)

Status: T (Tempered – 760 °C / 2 hours)

Current Type / Polarity:

• Current Type / Polarity: DC+

Electrode Specification:
FOX C 9 MV LNi / E ZCrMo91 B / E9015-B91

Redrying

• 300–350 °C / 2 hours

Welding and Heat Treatment Instructions

The temperature between the preheating and the weld pass should be controlled between 200 and 350 °C. To optimize impact toughness, a welding technique that ensures a thin weld bead and low heat input is recommended.

After welding, the weld temperature must be lowered below 100 °C to allow the martensitic transformation to complete. Post-weld heat treatment (PWHT) is typically performed at temperatures between 750 and 770 °C for a minimum of 2 hours.

PWHT for castings may require a lower holding temperature, such as approximately 730 °C; however, a longer holding time, such as ≥ 8 hours, should be applied.

During the period between welding and the final PWHT, holding the material at a temperature above the dew point or storing it in a humidity-controlled environment is strongly recommended. For thick-walled components, a hydrogen-removal heat treatment at temperatures between 260 and 400 °C may be applied before cooling to room temperature.

All information provided is based on careful review and extensive research. However, no liability is accepted for its accuracy, and the information is subject to change without prior notice.

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All information provided is based on careful review and extensive research. However, no liability is accepted for its accuracy, and the information is subject to change without prior notice.