... spirals 2. High quality 3. ISO9001 4. OEM service. 1) Nickel-chromium alloy: Cr20Ni80,Cr15Ni60, Cr20Ni35, Cr20Ni30, Cr25Ni20, etc. Such as ... -Al alloy: 1Cr13Al4,0Cr21Al4,0Cr21Al6,0Cr25Al5,0Cr21Al6,0Cr21Al6Nb, 0Cr27Al7Mo23) Copper-nickel alloy :CuNi1,CuNi2,CuNi10,CuNi14,CuNi19,CuNi23,CuNi34,CuNi44,6J40 ...