ISOMIL - Mineral Insulated Cables
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Sheath Materials

Supply and demand on the mineral insulated cable market comprise a vast array of sheath qualities with the main emphasis on materials suitable for certain applications and those with a historical basis. To limit this choice to an acceptable range as far as production and stock are concerned we are obliged, in particular with high grade stainless steels, to carry out a selective process for our standard production programme. A number of other sheath material qualities are available, and can be used for customer specials.

The following table and explanations are intended as an aid. By comparing the qualities available the customer is in a position to select the most suitable sheath material for his own purpose from the ISOMIL qualities available.

Common Sheath Materials

Material No. Short Description AISI (USA) BS (GB) AFNOR (FR) UNI (IT)
1.4301 (X5CrNi 18-9)304 304S Z6CN 18-09 X5CrNi 1810
1.4306 (X5CrNi 19-11 ) 304L 304S Z2CN 18-10 X3CrNi 1811
1.4401 (X5CrNiMo 18-10) 316 316S Z6CND 17-11 X5CrNi MO1712
1.4404 (X2CrNiMo 18-10) 316L 316S Z2CND 17-12 X2CrNiMo 1712
1.4541 (X6CrNiTi 18-10) 321 321S Z6CNT 18-11 X6CrNiTi 1811
1.4550 (X6CrNiNb18-10) 347S Z6CNNb 18-11 X6CrNiNb 1811
1.4571 (X6CrNiMoTi 17-12-2) 316TI 320 S31 Z6CNDT 17-12 X6CrNiMoTi 1712
1.4845 (X12CrNi 25-21 ) 310S 310S Z12CN 25-20 X6CrNi 2521
 ASTM
2.4816Alloy 600600  NC15FeB163. 166-168
2.4851Alloy 601601   
1.4876Alloy 800 800 NA15 Z10NG32-21 
2.4858Alloy 825 825 NA16 NFe 32C20DU 
Incotherm TGNicromil  3072-3074  
 Roy. Swed.
2.4951Nimonic 75 HR 203, 504NC20TMH. 05


Composition and Physical Properties

(Composition of Sheath Material wt.-%)

Material No. Ni Cr C max. Si max. Mn max. Fe Mo* Others**
1.4301 8,0-10,517,0-20,00,071,02,0Rest   
1.4306 10,0-12,018,0-20,00,031,02,0Rest  
1.4401 10,5-13,516,5-18,50,071,02,0Rest2,0-2,5 
1.4404 10,0-13,016,5-18,50,031,02,0Rest2,0-2,5 
1.4541 9,0-12,017,0-19,00,081,02,0Rest Ti > 5xC
1.4550 9,0-12,017,0-19,00,081,02,0Rest Nb > 8xC
1.4571 10,5-13,516,5-18,50,081,02,0Rest2,0-2,5Ti > 5xC
1.4845 19,0-22,024,0-26,00,081,02,0Rest N < 0,11
1.4876 30,0-34,019,0-23,00,121,02,0Rest Ti und AI 0,15-0,60
2.4858 38,0-46,019,5-23,50,050,51,0 2,5-3,5Ti 0,6-1,2 Cu 1,5-3,0
2.4816 >72,014,0-17,00,150,51,06,0-10,0  
2.4851 58,0-63,021,0-25,00,100,5 1,0  Ti < 0,5 AI 1,0-1,7
Incotherm TG 73,622,0 1,4  3,0  
2.4951 Rest18,0-21,00,08-0,151,01,0<5,0 Ti 0,2-0,6
*) Molybdenum can be used - depending of the alloy - to improve corrosion resistance to a number of acids and resistance to pitting.
**) Niobium and Titanium bind the carbon (as carbide formers) thus preventing the formation of Cr carbides on the grain boundaries during welding which could lead to embrittlement in the welding zone.
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