Metallurgical Principles Governing the Creep-Rupture Strength of Type 321 (“18-8 + Ti”) Austenitic Steel Superheating Tubing With Limited Extension to Type 304 (“18Cr-8Ni”) and Type 316 (“18Cr-8Ni + Mo”) Austenitic Steels

1963 ◽  
Vol 85 (2) ◽  
pp. 119-146 ◽  
Author(s):  
J. E. White ◽  
J. W. Freeman
Keyword(s):  
Austenitic Steel ◽  
Rupture Strength ◽  
Creep Rupture ◽  
Austenitic Steels ◽  
Creep Rupture Strength ◽  
Type 304

scholarly journals Effect of Additions of Ti, Nb, V and Ti, Nb, B on Creep-Rupture Strength of High-Mn Austenitic Steel

1970 ◽  
Vol 56 (6) ◽  
pp. 760-771
Author(s):  
Tohru MIMINO ◽  
Kazuhisa KINOSHITA ◽  
Isao MINEGISHI ◽  
Takayuki SHINODA
Keyword(s):  
Austenitic Steel ◽  
Rupture Strength ◽  
Creep Rupture ◽  
Creep Rupture Strength

Cold Work Effect on Creep Rupture Strength of Austenitic Boiler Steels

2007 ◽  
Author(s):  
Fujimitsu Masuyama
Keyword(s):  
High Temperature ◽  
Creep Strength ◽  
Rupture Strength ◽  
Cold Work ◽  
Creep Rupture ◽  
Austenitic Steels ◽  
Chemical Compositions ◽  
Creep Rupture Strength ◽  
Cold Worked

In order to clarify the effect of cold work, warm work at working temperatures of up to 400°C and chemical compositions on the creep rupture strength of austenitic steels used for boiler tubing and high temperature support structures, long-term creep rupture tests were carried out on typical 18Cr-8Ni system steels consisting of TP304H, TP316H, TP321H and TP347H grade tubes and of TP321 plates. The long-term (100,000 hours) creep rupture strength of these steels was evaluated in terms of working ratio and Ni-equivalent. It was consequently clarified that creep rupture strength was substantially reduced in the cold-worked TP321 and TP321H materials, although warm-work resulted in less work-induced deterioration. It was also found creep rupture strength was enhanced by the higher Ni-eq in 18Cr-8Ni austenitic steels, and that the combined conditions of working ratio and Ni-eq govern the creep rupture strength criteria of weaker or stronger than as-received strength. Additionally the effect of cold work on the creep rupture strength and ductility of recently developed creep-strength enhanced 23Cr austenitic stainless steel (a candidate material for the hot end of superheaters in ultra-high temperature fossil-fired power plants) was considered. The strength of cold worked 23Cr austenitic steel was observed to fall below the as-received strength at stresses within about 120MPa, while re-solution annealing recovered the creep strength level to the as-received strength across the entire stress region.

Heat-to-Heat Variation in Creep Properties of Types 304 and 316 Stainless Steels

1975 ◽  
Vol 97 (4) ◽  
pp. 243-251 ◽  
Author(s):  
V. K. Sikka ◽  
H. E. McCoy ◽  
M. K. Booker ◽  
C. R. Brinkman
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Ultimate Tensile Strength ◽  
Rupture Strength ◽  
Creep Rupture ◽  
Creep Rupture Strength ◽  
Creep Properties ◽  
316 Stainless Steel ◽  
Relationship Of ◽  
Type 304

A wide variation in creep-rupture and long-term creep properties of 20 heats of type 304 and seven heats of type 316 stainless steel was observed. The observed variation in 1000-hr creep-rupture strength, SRt, has been related to the corresponding ultimate tensile strength variation, Sur, by a relationship of the form: SRt=αexp(βSur), where α and β are material constants. This relationship between creep-rupture strength and ultimate tensile strength was further extended for minimum-expected 105-hr creep-rupture strength data reported in the literature. The heat-to-heat variation in ultimate tensile strength for both types 304 and 316 stailness steel was explained in terms of carbon plus nitrogen content and grain intercept, d, by a relationship of the form Sur = A(C + N)−1/2 + B, where A and B are constants for a given temperature. The time to onset of third-stage creep for various heats of type 304 and 316 stainless steel was related to time to rupture by relationships that are independent of test temperature, for test times reaching 22,622 hr.

Creep Rupture Strength Evaluation With Region Splitting by Half Yield

2013 ◽  
Author(s):  
Kazuhiro Kimura
Keyword(s):  
Creep Strength ◽  
Rupture Strength ◽  
Rupture Life ◽  
Creep Rupture ◽  
Austenitic Steels ◽  
Ferritic Steels ◽  
Creep Rupture Strength ◽  
Stress Regime ◽  
Bainitic Microstructure ◽  
Creep Resistant Steels

Creep strength of ferritic and austenitic steels has been investigated on the correlation between stress vs. creep rupture life curve and 50% of 0.2% offset yield stress (half yield) at the temperatures. Inflection of stress vs. creep rupture life curve was recognized on ferritic creep resistant steels with martensitic or bainitic microstructure. However, no identifiable correlation was observed on ferritic steels with ferrite and pearlite microstructure, as well as austenitic steels and superalloys except for several alloys. Ferritic steel with martensitic or bainitic microstructure indicates softening during creep exposure, however, hardening due to precipitation takes place in the ferritic steel with ferrite and pearlite microstructure and austenitic steels. This difference in microstructural evolution is associated with indication of inflection at half yield. Stress range of half yield in the stress vs. creep life diagram of creep strength enhanced ferritic steels is wider than that of conventional ferritic creep resistant steels with martensitic or bainitic microstructure. As a result of wide stress range of boundary condition, risk of overestimation of long-term creep rupture strength by extrapolating the data in high-stress regime to low-stress regime is considered to be high for creep strength enhanced ferritic steels.

Effects of some carbide stabilizing elements on creep-rupture strength and microstructural changes of 18-10 austenitic steel

1973 ◽  
Vol 4 (5) ◽  
pp. 1213-1222 ◽  
Author(s):  
Takayuki Shinoda ◽  
Tomoyuki Ishii ◽  
Ryohei Tanaka ◽  
Tohru Mimino ◽  
Kazuhisa Kinoshita ◽  
...  
Keyword(s):  
Austenitic Steel ◽  
Rupture Strength ◽  
Creep Rupture ◽  
Creep Rupture Strength ◽  
Microstructural Changes

KUBOTA ALLOY KHR35C

Alloy Digest ◽  
1999 ◽  
Vol 48 (7) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Rupture Strength ◽  
Creep Rupture ◽  
Creep Rupture Strength ◽  
Temperature Performance

Abstract Kubota alloy KHR35C is similar to HP alloy with the addition of niobium to increase its creep-rupture strength. Typical applications include components and assemblies for severe carburizing environments, such as ethylene pyrolysis coils. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as casting and joining. Filing Code: SS-753. Producer or source: Kubota Metal Corporation.

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