Iron-nickel and iron-nickel-cobalt alloys with low expansion
1 Scope
This standard specifies the dimensions, shapes, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of bars, strips, flat bars, wires and pipes made of iron-nickel alloy of Grade 4J36, free-cutting alloy of Grade 4J38 and iron-nickel-cobalt alloys of Grades 4J32, 4J32A and 4J40.
This standard is applicable to the manufacture of low-expansion iron-nickel and iron-nickel-cobalt alloys for instrument parts of approximately constant dimension and high precision within a certain range of ambient temperature.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyryl methane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of copper content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The neocuproine-chloroform extraction photometric method for the determination of copper content
GB/T 223.20 Methods for chemical analysis of iron, steel and alloy - The fotentiometric titration method for the determination of cobalt content
GB/T 223.21 Methods for chemical analysis of iron, steel and alloy - The 5-Cl-PADAB spectrophotometricmethod for the determination of cobalt content
GB/T 223.22 Methods for chemical analysis of iron, steel and alloy - The nitroso-R-salt spectrophotometric method for the determination of cobalt content
GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.40 Iron, steel and alloy - Determination of niobium content - The sulphochlorophenol S spectrophotometric method
GB/T 223.52 Methods for chemical analysis of iron, steel and alloy - The hydroxylamine hydrochloride-iodometric method for the determination of selenium content
GB/T 223.59 Methods for chemical analysis of iron, steel and alloy - The reduced molybdoantimonyl phosphoric acid photometric method for the determination of phosphorus content
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content
GB/T 223.67 Iron, steel and alloy - Determination of sulfur content - Methylene blue spectrophotometric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
Foreword i
1 Scope
2 Normative references
3 Order content
4 Classification and codes
5 Dimensions and shapes
6 Technical requirements
7 Test methods
8 Inspection rules
Annex A (Informative) Typical average linear expansion coefficient of alloy
