This standard specifies the technical requirements, uses, inspection methods, acceptance rules, and marking, packaging, storage and transportation methods of argon, nitrogen and hydrogen for heat treatment. This standard applies to gases used for protection, cooling and other purposes in heat treatment. JB/T 7530-1994 General Technical Requirements for Argon, Nitrogen and Hydrogen for Heat Treatment JB/T7530-1994 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T7530-94
Argon, nitrogen and hydrogen for heat treatment
General technical conditions
Published on October 25, 1994Www.bzxZ.net
Ministry of Machinery Industry of the People's Republic of China
Implementation on October 1, 1995
Mechanical Industry Standard of the People's Republic of China
Fluorine, nitrogen and hydrogen for heat treatment
General technical conditions
1 Subject content and scope of application
JB/T7530-94
This standard specifies the technical requirements, uses, inspection methods, acceptance rules and marking, packaging, storage and transportation methods of hydrogen, oxygen and hydrogen for heat treatment.
This standard applies to gases for protection, cooling and other purposes of heat treatment. 2 Reference standards
GB3864
GB4842
GB 4843
GB4962
GB5099
GB7144
GB7445
GB7446
GB8979
GB 8980
GB10624
3 Technical requirements
Dangerous goods packaging mark
Industrial gaseous nitrogen
Hydrogen test method
Safety regulations for hydrogen use
Steel seamless gas cylinder
Gas cylinder color marking
Hydrogen test method
High purity nitrogen
High purity hydrogen
High purity hydrogen
High purity hydrogen for heat treatment, hydrogen, high purity nitrogen, pure nitrogen, industrial gaseous nitrogen, hydrogen can be selected from the qualified grade of high purity hydrogen of GB10624, hydrogen of GB4842, qualified grade of high purity nitrogen of GB8980, superior grade of pure nitrogen of GB8979, Class 1 and I of industrial gaseous nitrogen of GB3864 and pure hydrogen grade of hydrogen of GB7445. Their quality should meet the technical requirements of Table 1. Table 1
Indicator requirements
High purity hydrogen
High purity nitrogen
≥99.999
Approved by the Ministry of Machinery Industry on October 25, 1994
Nitrogen content
≤0.0005
≥99.999
≥99.996
Hydrogen content
≤0.0001
≤0.0005
≤0.0001
≤0.0005
%(V/V)
Oxygen content
≤0.0002
≤0.0003
Total carbon content
(in terms of methane)
≤0.0002||t t||≤0.0003
CO≤0.0005
CO;≤0.0005
CH,≤0.0005
Water content
≤0.0004
≤0.0005\
≤0.0005\
1995-10-01Implementation
■Class|Grade
Class 1[Grade
Hydrogen content
Nitrogen content
JB/T7530-94
Continued Table 1
Indicator requirements%(V/V)
Ammonia content
Note: 1) Water content is measured at 15C and greater than 11.8MPa. 2) Contains trace inert gases oxygen, hydrogen, and effective. 3) The rolling mill does not specify the water content, oxygen content, total carbon content (measured in methane) CO≤0.0005. The general uses and inapplicable ranges of various gases in heat treatment are shown in Table 2. Table 2
High-purity argon
High-purity fluorine
Industrial gaseous nitrogen
Test method
General use
Vacuum heat treatment backfill gas and cooling gas
All kinds of stainless steel, high-temperature alloy, titanium alloy, steel alloy, precision alloy, heat treatment such as protective gas All kinds of structural steel, tool steel vacuum heat treatment backfill gas and cooling gas, ion nitriding gas source
All kinds of structural steel, tool steel heat treatment heating protective gas, carbon, carbonitriding carrier gas, ion nitriding gas source Stainless steel, low carbon steel, electrical steel remote fire protective gas High-purity hydrogen is tested according to GB10624. The gas is tested according to GB4843.
High-purity nitrogen is tested according to GB8980. Pure nitrogen is tested according to GB8979.
Industrial gaseous nitrogen is tested according to GB3864. 5.5
Hydrogen shall be inspected in accordance with the provisions of GB7446.
Acceptance rules
CO;≤0.0005
CH,≤0.001
Water content
Road point≤-43C
Free water≤100mL/bottle
Free high water≤100mL/bottle
Scope of non-application
Not applicable to heat treatment heating protection or vacuum heat treatment backfill gas for precipitation hardening stainless steel, maraging steel, high temperature alloy, titanium alloy, etc.
Not applicable to heat treatment protection gas for high strength steel, titanium alloy, brass
High purity hydrogen, hydrogen, high purity nitrogen, pure nitrogen, industrial gaseous nitrogen, and hydrogen for heat treatment shall be inspected and accepted by the quality inspection department of the manufacturer. 6.2 The manufacturer shall ensure that the quality of the products leaving the factory meets the requirements of this standard and issue its certificate of conformity. The content of the certificate includes: a.
Product name and quality grade;
Manufacturer name;
Production license;
Production date or production batch number;
Implementation standard number;
Cylinder number;
JB/T753094
Quantity (m\), pressure (MPa) or mass (kg). 6.3 The user shall first check the product certificate. If necessary, it may be inspected and accepted according to the inspection methods and acceptance rules specified in this standard. Its technical indicators shall meet the technical requirements of this standard. 6.4 When all the inspection results meet the requirements of this standard, the whole batch shall be accepted. 6.5 When any indicator of the inspected sample does not meet the requirements of this standard, double sampling shall be taken from the same batch of products for re-inspection. If any item still does not meet the requirements of this standard, the whole batch shall be rejected. Products inspected bottle by bottle (container) cannot be re-sampled and inspected. 6.6 When users and manufacturers have objections to product quality, both parties shall jointly inspect, accept and resolve through negotiation, or apply for arbitration. 7 Marking, packaging, transportation and storage
7.1 The marking, packaging, transportation and storage of gas cylinders and containers shall comply with the relevant provisions of the "Gas Cylinder Safety Supervision Regulations", "Pressure Vessel Safety Supervision Regulations" and "Dangerous Goods Transportation Rules" promulgated by the former State Bureau of Labor. 7.2 The packaging markings shall comply with the provisions of GB190, 7.3 The color markings of gas cylinders shall comply with the provisions of GB7144. Gas cylinders containing hydrogen should be painted silver-gray and marked with dark green "high-purity hydrogen" and "hydrogen"; containers containing nitrogen should be painted black and marked with light yellow "high-purity nitrogen", "pure nitrogen", "general nitrogen" (or industrial nitrogen) words; gas cylinders containing hydrogen should be painted light green and marked with bright red "oxygen". 7.4 Gas cylinders for bottled hydrogen, hydrogen and hydrogen should be made of seamless steel cylinders, and the cylinders and maximum allowable pressures shall comply with the provisions of GB5099. 7.5 The pressure of bottled oxygen and chlorine should be 14 ± 0.7MPa at 20C. The pressure of bottled oxygen should be 12.3 ± 0.5MPa at 20C. The accuracy of the pressure gauge used for measurement should not be lower than Class 2.5. 7.6 Before leaving the factory, bottled gases should be checked for leakage at the bottle mouth, bottle valve threaded connection and bottle valve rod, and the bottle cap should be installed. 7.7 When the empty bottles are returned to the manufacturer after use, the residual pressure in the hydrogen and hydrogen cylinders shall not be lower than 0.2MPa, and the residual pressure in the nitrogen cylinder shall not be lower than 0.5MPa.
7.8 Safety should be paid attention to during the use, packaging, transportation and storage of hydrogen, and the provisions of GB4962 and GB7445 should be complied with. Additional remarks:
This standard is proposed and managed by the National Technical Committee for Heat Treatment Standardization. This standard was drafted by the 621st Institute of the Ministry of Aeronautics and Astronautics. The drafters of this standard were Wang Guangsheng and Ding Yong.
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