What Is Resistance Wire?

Resistance wire is an electrical component that generally converts electrical energy into internal energy. Generally speaking, as the temperature rises, the resistance of It-inch metal increases; carbon, semiconductors, or electrolytes do the opposite. Resistance decreases as temperature rises. In this way, in a certain temperature range, we can consider that the temperature change and the resistance change have a linear relationship, so we can convert the temperature change into a change in resistance. ^[1]

Material: 0Cr25Al5, Cr20Ni80, Cr15Ni60, GH140

Wire diameter (mm)	Cross-sectional area (mm2)	Per meter Surface area cm2 / m	Cr20Ni80		Cr30Ni70		Cr15Ni60
			Weight per meter kg / m	Resistance per meter / m, 20	Weight per meter kg / m	Resistance per meter / m, 20	Weight per meter kg / m	Resistance per meter / m, 20
0.10	0.007854	3.142	0.00006597	138.8	0.00006362	150.2	0.00006440	142.6
0.12	0.01131	3.770	0.00009500	96.38	0.00009161	104.3	0.00009274	99.03
0.15	0.01767	4.712	0.0001484	61.68	0.0001431	66.77	0.0001449	63.38
0.17	0.02270	5.341	0.0001907	48.02	0.0001839	51.99	0.0001861	49.34
0.19	0.02835	5.969	0.0002382	38.44	0.0002297	41.62	0.0002325	39.50
0.21	0.03464	6.597	0.0002909	31.47	0.0002806	34.07	0.0002840	32.34
0.25	0.04909	7.854	0.0004123	22.21	0.0003976	24.04	0.0004025	22.82
0.27	0.05726	8.482	0.0004809	19.04	0.0004638	20.61	0.0004695	19.56
0.29	0.06605	9.111	0.0005548	16.50	0.0005350	17.86	0.0005416	16.96
0.31	0.07548	9.739	0.0006340	14.44	0.0006114	15.63	0.0006189	14.84
0.35	0.09621	11.00	0.0008082	11.33	0.0007793	12.26	0.0007889	11.64
0.40	0.1257	12.57	0.001056	8.674	0.001018	9.390	0.001030	8.913
0.45	0.1590	14.14	0.001339	6.835	0.001288	7.419	0.001304	7.042
0.50	0.1963	15.71	0.001469	5.551	0.001590	6.010	0.001610	5.704
0.60	0.2827	18.85	0.002375	3.855	0.002290	4.173	0.002318	3.961
0.70	0.3848	21.99	0.003233	2.832	0.003117	3.066	0.003156	2.910
0.80	0.5027	25.13	0.004222	2.168	0.004072	2.348	0.004122	2.228
0.90	0.6362	28.27	0.005344	1.713	0.005153	1.855	0.005217	1.761
1.00	0.7854	31.42	0.006597	1.388	0.006362	1.502	0.006440	1.426
1.20	1.131	37.70	0.009500	0.9638	0.009161	1.043	0.009274	0.9903
1.40	1.539	43.98	0.01293	0.7081	0.01247	0.7665	0.01262	0.7276
1.60	2.011	50.27	0.01689	0.5421	0.01629	0.5869	0.01649	0.5570
1.80	2.545	56.55	0.02138	0.4283	0.02061	0.4637	0.02087	0.4401
2.00	3.142	62.83	0.02639	0.3470	0.02545	0.3756	0.02576	0.3565
2.20	3.801	69.12	0.03139	0.2867	0.03079	0.3104	0.03117	0.2946
2.50	3.976	70.69	0.03340	0.2741	0.03221	0.2968	0.03260	0.2817
2.80	6.158	87.96	0.05172	0.1770	0.04988	0.1916	0.05049	0.1819
3.00	7.069	94.25	0.05938	0.1542	0.05726	0.1669	0.05796	0.1584
3.50	9.621	110.0	0.08082	0.1133	0.07793	0.1226	0.07889	0.1164
4.00	12.57	125.7	0.1056	0.08674	0.1018	0.09390	0.1030	0.08913
4.50	15.90	141.4	0.1336	0.06853	0.1288	0.07419	0.1304	0.07042
5.00	19.63	157.1	0.1649	0.05551	0.1590	0.06010	0.1610	0.05704
5.50	23.76	172.8	0.1996	0.04588	0.1924	0.04967	0.1948	0.04714
6.00	28.27	188.5	0.2375	0.03855	0.2290	0.04173	0.2318	0.03961
6.50	33.18	204.2	0.2787	0.03285	0.2688	0.03556	0.2721	0.03375
7.00	38.48	219.9	0.3233	0.02832	0.3117	0.03066	0.3156	0.02910

1,

^[3] 1) The oxide scale in the furnace must be cleaned frequently with a brush, broom or compressed air to prevent it from falling on the alloy elements and causing short circuit. Generally, cleaning should not be less than once a month.
2) After each period of use, heat-resistant steel components such as bottom plates, dried oranges, and furnace tanks should be lifted and struck to remove the iron oxide scale, so as not to collapse or bury components. Especially the chromium-manganese-nitrogen steel, the peeling is more serious in the later stage.
3) The lower teeth of the box door and the ring knife of the parallel furnace cover must be inserted tightly into the sand seal groove. The sand in the sand seal cannot be overfilled and level. If the sand falls into the furnace, it should be cleaned in time. For low temperature furnaces, a good layer of asbestos rope padding can be used.
4) The externally heated salt bath furnace should periodically lift out the orange vortex to remove molten salt. Condensate on the component surface can be washed with hot water; condensate on the shelf can be removed by scraping.
5) The cover of the brass thermal insulation furnace must be tightly connected to prevent "copper frost" from falling into the furnace and eroding the components.
6) Avoid contacting non-ferrous metals such as copper, aluminum, zinc, tin, lead and electric heating elements, whether it is fine powder, melt or steam, the erosion of components at high temperatures is very harmful. This is because "pits" are formed in the eroded area, the cross section becomes smaller, and finally it burns out due to overheating.
7) The cover of the trolley for the electric annealing furnace should be tightly capped to prevent overheating and melting due to falling into the sand and burying the components when the casting is annealed. Therefore, it is necessary to check frequently and remove the sand in time.
8) Due to thermal expansion and contraction and creep elongation during heating and shutdown, the bolts leading out of the rod wiring clamp are prone to oxidative loosening, and should be regularly checked and tightened.
9) The hole of the lead rod must be tightly closed to prevent leakage of protective gas from burning, which will cause the rod body to oxidize and peel, so that the lead rod and the clip have poor contact.
10) In a non-tank carburizing furnace or in a controlled atmosphere containing CO, the release of carbon will cause a short circuit. Therefore, the furnace door should be frequently opened or blown with compressed air regularly to burn off the carbon burning materials in time.