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A metal alloy of several chemical elements, which is distinguished by the precise dosage of each component component and the absence of harmful impurities, which can reduce the working capacity of a product from this material under certain industrial conditions, is called the precision raw material. The accuracy of manufacturing such materials concerns not only their chemistry, in the production process, full compliance of the semi-finished product with the declared geometric dimensions and high quality of its surface is ensured. To date, such raw materials are used for the manufacture of particularly critical parts, working in the most important areas of the industrial complex.

Specifications of alloy 38KDD

The 38KD alloy due to the strictly fixed value of linear temperature expansion (from 7 to 7.8 units per degree) is able to maintain high stability of the characteristics in a fairly wide temperature range, from minus sixty to plus four hundred degrees Celsius. This property allows the use of parts made of a similar material in different climatic conditions, without loss of basic performance. Quite often such material as alloy 38KKD is used in the manufacture of elements that presuppose in the process of work a vacuum soldering with glass.


Chemical composition as a percentage
silicon carbon iron manganese phosphorus nickel sulfur cobalt
Up to 0,4 Up to 0,3 49.72−53.5 37.5−38.5 4.5−5.5 Up to 0,015 Up to 0.02 4.5−5.5
physical characteristics
Name Units Symbol The numerical value
Elastic modulus MPa E * 10−5 1.5
Measurement temperature ◦ C T 20
Electrical resistance (specific) Ohm * m R * 10 9 500
Mechanical properties (at 20 ° C)
Name of the characteristic The numerical value of the parameter
Short-term tensile strength, MPa (ss) 450−550
Relative elongation at break,% (d5) 23
Heat treatment annealing

Magnetic characteristics

Coercive force (not more than), (A / m) Ns
Magnetic permeability (not more than), (MH / m) Umax
Specific losses (no more) at a frequency of 50 Hz and a magnetic induction of 1 T, (W / kg) P1,0 / 50
The magnetic induction T (at least), with a magnetic field strength of 100, in magnetic fields (A / m) B100

Weldability indexes

The alloy has limitations on weldability The welding process requires some preliminary preparation (warming the contacting surfaces to one hundred and one hundred and twenty degrees and subsequent heat treatment of the seam zone)
The alloy has no weld constraints No additional operations are required
Hard to weld material It is necessary to warm the contacting surfaces to two hundred or three hundred degrees, the subsequent annealing and heat treatment after the end of the welding process

Buy at the best price

A wide range of products from the 38KKD alloy is always available in the warehouse of LLC «_.» The prices for products made from such raw materials presented on our website will pleasantly surprise you, and the available way of ordering and choosing the most convenient delivery option will provide maximum comfort to the buyer. Brands of products from precision alloys in our country will allow us to select the necessary material for solving any of the most complicated production tasks.