CD4MCu--What are the characteristics of this material? Is it resistant to high temperatures and corrosion?

No. Low-carbon duplex stainless steel features controlled chromium and nickel equivalents to regulate the ratio of ferrite to austenite in the duplex structure, and nitrogenizing elements are added to nitride the matrix. Under appropriate heat treatment conditions, the alloy is hardened, resulting in good corrosion resistance as well as good wear resistance, and it also exhibits resistance to stress corrosion in media containing chloride ions. Resistant to dilute sulfuric acid at room temperature. Tensile strength σb ≥ 700 MPa, yield strength σ0.2 ≥ 485 MPa, hardness HB300. This steel has high levels of chromium, molybdenum, and nitrogen, which gives it excellent resistance to pitting corrosion, crevice corrosion, and uniform corrosion. In media containing a solid phase, it exhibits excellent wear and corrosion resistance.

Which one is better compared to 310S? I require one that can be welded to 316L.

It belongs to duplex stainless steel. The CD-4MCu alloy is essentially ferritic; its yield strength is about twice that of the 19Cr-9Ni austenitic alloy, and it possesses high hardness, good tensile ductility, and satisfactory impact toughness. The alloy’s high strength and hardness, combined with its excellent corrosion resistance, make it particularly suitable for use in conditions subject to corrosion (including abrasion and erosion). The corrosion resistance of alloy CD-4MCu in many corrosive media is better than that of CF alloy; it is widely used in strong acidic environments with oxidative and reducing conditions, and possesses exceptional resistance to stress corrosion cracking in chloride-containing environments. After solution treatment, CD-4MCu can be further strengthened by precipitation hardening induced by aging at 480–510 degrees. The degree of aging reaction, as well as all the properties of the alloy in its aged state—including corrosion resistance, strength, impact toughness, and susceptibility to quench cracking—are related to the multiphase treatment method, that is, to the temperature of solution treatment, the aging temperature, and the aging time. Since the alloy possesses sufficient strength and excellent corrosion resistance in many applications after solution treatment, it is not commonly used in the aged state.

This material is often used in phosphate plants; it offers good corrosion resistance and is inexpensive； For high-temperature sulfuric acid media, design institutes generally choose 20# alloy steel ；