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Technical Brief

Strength of 316FR Joints Welded by Type 316FR/16-8-2 Filler Metals

[+] Author and Article Information
Takuya Yamashita, Yuji Nagae

Japan Atomic Energy Agency,
Ibaraki 311-1393, Japan

Kenichiro Satoh

Mitsubishi FBR Systems,
Tokyo 150-0001, Japan

Kenji Yamamoto

Mitsubishi Heavy Industries,
Takasago 676-8686, Japan

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 2, 2015; final manuscript received August 18, 2015; published online October 6, 2015. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 138(2), 024501 (Oct 06, 2015) (7 pages) Paper No: PVT-15-1033; doi: 10.1115/1.4031444 History: Received March 02, 2015; Revised August 18, 2015

Type 316 stainless steel with low-carbon and medium-nitrogen contents called 316FR stainless steel is a candidate structural material for reactor vessels and internals of future-generation fast breeder reactors (FBRs). The reactor vessel cannot be manufactured from rolled or forged steel, but can be built at reasonable cost by welding rolled steel plates. In this manufacture approach, the reliability of the welded joint must be indicated. Two types of filler metals are candidates for 316FR welded joints: types 316FR and 16-8-2 filler metals. The chemical composition of type 316FR filler metal is close to that of the stainless steel; type 16-8-2 filler metal contains lower amounts of Ni, Cr, and Mo than that of the stainless steel. This study evaluated the need to consider the welded joint strength reduction factors in 316FR welded joints under design of future-generation FBRs. To this end, the tensile and creep strengths of types 316FR and 16-8-2 weld metals were measured, and the effect of δ-ferrite in weld metals was evaluated in creep strength tests of 316FR welded joints. In tensile and creep strengths of 316FR welded joints welded by both metal types, the welded joint strength reduction factors were immaterial. The creep strength of 316FR welded joints was negligibly affected by δ-ferrite levels from 4.1 to 7.0 ferrite number (FN) in the Welding Research Council-1992 diagram. Furthermore, the tensile and creep strengths of 316FR welded joints by two methods (gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW)) were the same. Therefore, the tensile and creep strengths of 316FR welded joints in above condition are ensured the reliability of similar to 316FR stainless steels.

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Figures

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Fig. 1

Relationship between Cr equivalent and Ni equivalent of type 316FR/16-8-2 filler metals (reproduced from [15])

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Fig. 2

Vickers hardness across the base metal/weld metal section of 316FR welded joints (labeled TIG 316WJ and SMAW 316WJ)

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Fig. 3

Sampling location of test specimen from welded joint

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Fig. 4

(a) The 0.2% proof stress versus temperature for 316FR joints welded by type 316FR/16-8-2 filler metal. (b) Ultimate tensile strength versus temperature for 316FR joints welded by type 316FR/16-8-2 filler metal. (c) Elongation versus temperature for 316FR joints welded by type 316FR/16-8-2 filler metal. (d) Area reduction versus temperature for 316FR joints welded by type 316FR/16-8-2 filler metal.

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Fig. 5

Tensile strength comparison of base metals and weld metals

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Fig. 6

Failure location in welded joint tensile tests

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Fig. 7

Stress versus time to rupture for 316FR joints welded by type 316FR/16-8-2 filler metal

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Fig. 8

Stress versus time to rupture for 316FR base metals and filler metals

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Fig. 9

Creep strength of 316FR welded joints and corresponding failure locations

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Fig. 10

Effect of δ-ferrite in weld metals on creep properties at 550 °C

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Fig. 11

Tensile strength comparison of GTAW 316WJ and SMAW 316WJ

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Fig. 12

Creep strength comparison of GTAW 316WJ and SMAW 316WJ

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