Unlock instant, AI-driven research and patent intelligence for your innovation.

Ultra-low temperature stainless steel pipe fitting material and preparation method thereof

A stainless steel and ultra-low temperature technology, which is applied in the field of ultra-low temperature stainless steel pipe fitting materials and its preparation, can solve problems that cannot meet the requirements of natural gas storage systems, and achieve the effects of wide application and good toughness

Active Publication Date: 2021-11-26
ZHEJIANG JNDIA PIPELINE IND
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an ultra-low temperature stainless steel pipe fitting material and its preparation method to solve the problem that the nickel 5 steel used in large quantities can only be used under the condition of -156°C, which cannot meet the conditions of -196°C for the natural gas storage system, or even lower The problem of use requirements under the temperature conditions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The preparation method of the ultra-low temperature stainless steel pipe fitting material comprises the following steps:

[0033] (1) Mix C, Cl, Fe, Eu, and heat up to 1600-1650°C to prepare molten liquid a;

[0034] (2) Mix B, S, Cr, Mn, and Ce, and raise the temperature to 1300-1400°C to obtain molten liquid b;

[0035] (3) Mix Cu, Ni, Ag, La, and Nd and heat up to 1750-1850°C to obtain molten liquid c;

[0036] (4) Mix the molten liquid a obtained in step (1) and the molten liquid b obtained in step (2) uniformly at 1600-1700°C, cool down to 900-1000°C, then add Si and heat to 1750-1850°C ℃, mix evenly, keep warm for 1.5-2h, add molten liquid c prepared in step (3), keep warm for 1.2-1.5h, cool down to 1600-1620°C, melt and cast steel ingots in a vacuum furnace;

[0037] (5) Heating the steel ingot obtained in step (4) to 1200-1250°C, and forging it into a forging;

[0038] (6) Roll the forgings obtained in step (5) into pipes. The rolling temperature is 1200-1250...

Embodiment 1

[0042] A material for ultra-low temperature stainless steel pipe fittings, in parts by weight, including the following raw materials: Fe: 56 parts, Cr: 24 parts, Ni: 8 parts, Mn: 2 parts, Eu: 0.3 parts, La: 0.1 parts, Ce: 0.2 parts Parts, Nd: 0.2 parts, Ag: 0.12 parts, Cu: 0.15 parts, Si: 0.2 parts, C: 0.01 parts, B: 0.005 parts, S: 0.006 parts, Cl: 0.013 parts;

[0043] The preparation method of the ultra-low temperature stainless steel pipe fitting material comprises the following steps:

[0044] (1) Mix C, Cl, Fe, Eu, and heat up to 1620°C to obtain molten liquid a;

[0045] (2) Mix B, S, Cr, Mn, and Ce, and raise the temperature to 1330°C to obtain molten liquid b;

[0046] (3) Mix Cu, Ni, Ag, La, and Nd and heat up to 1750°C to obtain molten liquid c;

[0047](4) Mix the molten liquid a obtained in step (1) and the molten liquid b obtained in step (2) at 1620°C, cool down to 900°C, then add Si, heat to 1760°C, mix well, and keep warm 2h, add the molten liquid c obtaine...

Embodiment 2

[0052] A material for ultra-low temperature stainless steel pipe fittings, in parts by weight, including the following raw materials: Fe: 65 parts, Cr: 25 parts, Ni: 9 parts, Mn: 4 parts, Eu: 0.4 parts, La: 0.2 parts, Ce: 0.4 parts Parts, Nd: 0.2 parts, Ag: 0.15 parts, Cu: 0.18 parts, Si: 0.5 parts, C: 0.02 parts, B: 0.006 parts, S: 0.008 parts, Cl: 0.017 parts;

[0053] The preparation method of the ultra-low temperature stainless steel pipe fitting material comprises the following steps:

[0054] (1) Mix C, Cl, Fe, Eu and raise the temperature to 1630°C to obtain molten liquid a;

[0055] (2) Mix B, S, Cr, Mn, and Ce, and raise the temperature to 1380°C to obtain molten liquid b;

[0056] (3) Mix Cu, Ni, Ag, La, and Nd and heat up to 1790°C to obtain molten liquid c;

[0057] (4) Mix the molten liquid a obtained in step (1) and the molten liquid b obtained in step (2) at 1620°C, cool down to 980°C, then add Si, heat to 1820°C, mix well, and keep warm 1.8h, add the molten ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an ultra-low temperature stainless steel pipe fitting material and a preparation method thereof. The stainless steel pipe fitting material includes the following raw materials in parts by weight: Fe: 54-78 parts, Cr: 23-26 parts, Ni: 8-10 parts Parts, Mn: 2‑5 parts, Eu: 0.3‑0.5 parts, La: 0.1‑0.3 parts, Ce: 0.2‑0.5 parts, Nd: 0.2‑0.3 parts, Ag: 0.12‑0.16 parts, Cu: 0.15‑0.22 parts , Si: 0.2-0.7 parts, C: 0.01-0.03 parts, B: 0.004-0.007 parts, S: 0.005-0.009 parts, Cl: 0.012-0.018 parts; the material of the stainless steel pipe fittings is melted, mixed, cast, It is made by rolling, degreasing, straightening, flat head, ultrasonic flaw detection, eddy current flaw detection and other steps. The stainless steel pipe material prepared by the invention has good toughness performance at ultra-low temperature, and can be widely applied.

Description

technical field [0001] The invention belongs to the technical field of pipe material preparation, and in particular relates to an ultra-low temperature stainless steel pipe material and a preparation method thereof. Background technique [0002] Due to the application of ultra-low temperature stainless steel containers and equipment used in the transportation of liquefied natural gas (LNG), high requirements are placed on the materials of austenitic stainless steel pipe fittings. [0003] The nickel 5 steel currently used in large quantities can only be used at -156°C, which cannot meet the requirements of natural gas storage systems at -196°C or even lower temperatures. Therefore, how to develop a higher performance steel Stainless steel materials have become a new research direction to meet application requirements. Contents of the invention [0004] The invention provides an ultra-low temperature stainless steel pipe fitting material and its preparation method to solve...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/42C22C38/54C22C38/58C22C33/04C21D8/10
CPCC21D8/105C22C33/04C22C38/002C22C38/005C22C38/007C22C38/02C22C38/42C22C38/54C22C38/58
Inventor 王忠华王炳顺陈景昊周辉
Owner ZHEJIANG JNDIA PIPELINE IND