scholarly journals Embrittlement of Mn-Si and Mn-Mo High Strength Steels Caused by Heating in High Pressure Hydrogen at High Temperatures

1965 ◽  
Vol 6 (2) ◽  
pp. 101-106
Author(s):  
Tadashi Nemoto ◽  
Kazuo Tanosaki ◽  
Isao Masaoka
Keyword(s):  
High Pressure ◽  
High Temperatures ◽  
High Strength Steels ◽  
High Strength ◽  
Pressure Hydrogen

Hydrogen Compatibility and Suitability of (Ni)-Cr-Mo High-Strength Low-Alloy Seamless Line Pipe Steels for Pressure Vessels for Hydrogen Storage

2018 ◽  
Author(s):  
Akihide Nagao ◽  
Nobuyuki Ishikawa ◽  
Toshio Takano
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
High Strength ◽  
Pressure Vessels ◽  
Hydrogen Gas ◽  
Low Alloy Steels ◽  
Pipe Steels ◽  
Line Pipe ◽  
Alloy Steels ◽  
Pressure Hydrogen

Cr-Mo and Ni-Cr-Mo high-strength low-alloy steels are candidate materials for the storage of high-pressure hydrogen gas. Forging materials of these steels have been used for such an environment, while there has been a strong demand for a higher performance material with high resistance to hydrogen embrittlement at lower cost. Thus, mechanical properties of Cr-Mo and Ni-Cr-Mo steels made of quenched and tempered seamless pipes in high-pressure hydrogen gas up to 105 MPa were examined in this study. The mechanical properties were deteriorated in the presence of hydrogen that appeared in reduction in local elongation, decrease in fracture toughness and accelerated fatigue-crack growth rate, although the presence of hydrogen did not affect yield and ultimate tensile strengths and made little difference to the fatigue endurance limit. It is proposed that pressure vessels for the storage of gaseous hydrogen made of these seamless line pipe steels can be designed.

Mechanical Properties of a New Nitrogen-Strengthened Stainless Steel With Reduced Amount of Ni and Mo in High Pressure Gaseous Hydrogen

2013 ◽  
Author(s):  
Kazuhisa Matsumoto ◽  
Shinichi Ohmiya ◽  
Hideki Fujii ◽  
Masaharu Hatano
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
High Strength ◽  
Hydrogen Gas ◽  
Fracture Surfaces ◽  
Growth Properties ◽  
Pressure Hydrogen

To confirm a compatibility of a newly developed high strength stainless steel “NSSC STH®2” for hydrogen related applications, tensile and fatigue crack growth properties were evaluated in high pressure hydrogen gas up to 90MPa. At temperatures between −40 and 85°C, no conspicuous deterioration of tensile properties including ductility was observed even in 90 MPa hydrogen gas at −40°C while strength of STH®2 was higher than SUS316L. Although a slight drop of reduction of area was recognized in one specimen tested in 90 MPa hydrogen gas at −40°C, caused by the segregation of Mn, Ni and Cu in the laboratory manufactured 15mm-thick plate, it was considerably improved in the large mill products having less segregation. Fatigue crack growth rates of STH®2 in high pressure hydrogen gas were almost the same as that of SUS316L in air. Although fatigue crack growth rate in air was considerably decelerated and lower than that in hydrogen gas at lower ΔK region, this was probably caused by crack closure brought by oxide debris formed on the fracture surfaces near the crack tip by the strong contact of the fracture surfaces after the fatigue crack was propagated. By taking the obtained results into account, it is concluded that NSSC STH®2 has excellent properties in high pressure hydrogen gas in addition to high strength compared with standard JIS SUS316L.

Development of Design Criteria for a High Pressure Vessel Construction Code

1987 ◽  
Vol 109 (2) ◽  
pp. 256-259 ◽  
Author(s):  
G. J. Mraz
Keyword(s):  
High Pressure ◽  
Pressure Vessel ◽  
High Strength Steels ◽  
High Strength ◽  
Design Criteria ◽  
Construction Methods ◽  
Shrink Fitting ◽  
Section Viii ◽  
Pressure Stress ◽  
Selection Of

Out of concern for public safety, most legal jurisdictions now require unfired pressure vessel construction to comply with the ASME Boiler and Pressure Vessel Code. Because the present two divisions of Section VIII of that Code are not well suited for high pressure design, a new division is needed [1]. The currently anticipated main design criteria of the proposed division are full plastic flow or full overstrain pressure, stress intensity in the bore, fatigue, and fracture mechanics. The rules are expected to allow better utilization of high strength steels already included in the present Section VIII. At the same time materials of even higher strength are introduced. The benefits of compressive prestress are recognized. Construction methods allowing it’s achievement, such as autofrettage, shrink fitting and wire winding are included. Reasons for selection of the criteria are given.

Qualification Strategy for FAST-Pipe™ for High Pressure Gas Pipelines

2010 ◽  
Author(s):  
Mamdouh M. Salama
Keyword(s):  
High Pressure ◽  
High Pressures ◽  
Glass Fibers ◽  
Large Diameter ◽  
High Strength Steels ◽  
High Strength ◽  
Operational Parameters ◽  
Conventional Steel ◽  
Bending Load ◽  
Analysis Strategy

Because major reserves for natural gas are often remotely located from potential market, its transportation requires larger diameter pipes operating at high pressures. In order to reduce cost, high strength steels (≥ X80) have been advanced to reduce the wall thickness of the pipeline and thus lower materials, transportation and construction costs. However, producing large diameter high pressure pipelines of these steels creates significant challenges that can only be met by very few steel suppliers. This paper presents the qualification results of an alternative technology that will reduce cost even more than high strength steels while using conventional steel such as X70. This technology, which is designated as Fiber Augmented Steel Technology Pipe (FAST-Pipe™), involves hoop winding dry glass fibers over conventional steel pipes (e.g. X70) to provide the required high pressure capacity. The steel thickness is selected to mainly satisfy axial and bending load requirements. Following a proof-of-concept of the FAST-Pipe™, a detailed qualification program was developed based on a decision and risk analysis strategy that incorporates key elements of the industry technology qualification guidelines (DNV RP A203 and API 17N). The qualification program involved addressing fifteen design, construction and operational parameters. The paper presents the FAST-Pipe™ concept, discusses its advantages and summarizes the results of its qualification program.

Superhard Composite Containing Boron Nitride and Silicon Nitride

2012 ◽  
Vol 194 ◽  
pp. 199-203
Author(s):  
Ana Lúcia Diegues Skury ◽  
Shirlene Chagas ◽  
Sérgio Neves Monteiro
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Boron Nitride ◽  
Superhard Material ◽  
Cubic Boron Nitride ◽  
High Strength Steels ◽  
High Hardness ◽  
High Strength ◽  
Metallic Binder ◽  
Ferrous Alloys

As a superhard material, next to diamond, the cubic boron nitride (cBN) is of great interest owing to its efficiency in machining ferrous alloys. In nature, only the hexagonal, hBN, exists. In practice, high pressure and high temperature (HPHT) synthesis has to be used to produce small cBN crystals. For larger size machining inserts, the powder-like cBN crystals need to be sintered at specific HPHT conditions using a metallic binder. The present work investigates the sintering of cBN inserts using a Si3N4 binder agent. The results disclosed relatively high hardness for the inserts and revealed their effectiveness in machining high strength steels.

Sign in / Sign up

Export Citation Format

Share Document