View source for 18256577. STEEL PIPE FOR PRESSURE PIPING AND STARTING MATERIAL FOR STEEL PIPE simplified abstract (NIPPON STEEL CORPORATION)

=STEEL PIPE FOR PRESSURE PIPING AND STARTING MATERIAL FOR STEEL PIPE=


==Organization Name==

[[:Category:NIPPON STEEL CORPORATION|NIPPON STEEL CORPORATION]]


[[Category:NIPPON STEEL CORPORATION]]

==Inventor(s)==

[[:Category:Taizo Makino of Chiyoda-ku, Tokyo (JP)|Taizo Makino of Chiyoda-ku, Tokyo (JP)]][[Category:Taizo Makino of Chiyoda-ku, Tokyo (JP)]]

[[:Category:Masahiro Yamazaki of Chiyoda-ku, Tokyo (JP)|Masahiro Yamazaki of Chiyoda-ku, Tokyo (JP)]][[Category:Masahiro Yamazaki of Chiyoda-ku, Tokyo (JP)]]

==STEEL PIPE FOR PRESSURE PIPING AND STARTING MATERIAL FOR STEEL PIPE - A simplified explanation of the abstract==


This abstract first appeared for US patent application 18256577 titled 'STEEL PIPE FOR PRESSURE PIPING AND STARTING MATERIAL FOR STEEL PIPE

==Simplified Explanation==

The abstract describes a steel pipe for pressure piping that has undergone autofrettage, resulting in an outer layer region with an average hardness at least 1.20 times greater than the inner layer region. The residual stress at the outer and inner surfaces of the pipe is measured and used to estimate the residual stress at the inner surface.

* The steel pipe for pressure piping is subjected to autofrettage.
* The outer layer region of the pipe has an average hardness at least 1.20 times greater than the inner layer region.
* Residual stress at the outer and inner surfaces of the pipe is measured.
* The estimated residual stress at the inner surface is calculated based on the measured values.

### Potential Applications
This technology can be applied in industries requiring high-pressure piping systems, such as oil and gas, chemical processing, and aerospace.

### Problems Solved
This innovation helps improve the strength and durability of steel pipes used in pressure piping applications, reducing the risk of failure and enhancing overall safety.

### Benefits
- Increased resistance to pressure and stress
- Enhanced structural integrity
- Improved performance under extreme conditions

### Potential Commercial Applications
"Enhanced Steel Pipe for High-Pressure Piping Applications" 

### Possible Prior Art
Prior art may include studies on autofrettage techniques for improving the performance of pressure piping systems.

#### Unanswered Questions
#### How does the autofrettage process impact the overall lifespan of the steel pipe?
The abstract does not provide information on the long-term effects of autofrettage on the durability and longevity of the steel pipe.

#### Are there any specific industry standards or regulations that this technology must comply with?
The abstract does not mention any specific industry standards or regulations that the steel pipe must meet for use in pressure piping applications.


==Original Abstract Submitted==

A steel pipe for pressure piping subjected to autofrettage has an average hardness at its outer layer region of 1.20 times or more of an average hardness at its inner layer region. When an outer diameter is D, and an inner diameter is d, a measured value of a residual stress at an outer surface is denoted by σ, a measured value of a residual stress at an outer surface after halving is denoted by σ, and a measured value of a residual stress at an inner surface after the halving is denoted by σ, an estimated value σof a residual stress at the inner surface of the steel pipe is determined by [σ=(−σ)/(A×(t/T)−1)], [t/T=((σ−σ)/(A×(σ−σ)−C×σ))], [A=3.9829× exp(0.1071×(D/d))], and [C=−3.3966×exp(0.0452×(D/d))] is −150 MPa or less.



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