I bought a certain brand of hot water kettle, he is written on the top of the 308 stainless steel, but generally not all 304 a little afraid to use.

This is no problem. You can use 308 stainless steel kettle is possible. This is a tempered cup. 308 stainless steel name: austenitic stainless steel standard: AISI, ASTM Model: 308 UNS number: S30800 standard number: 06Cr20Ni11 ● 308 toughened ①: Carbon C: ≤ 0.08 manganese Mn: ≤ 2.00 silicon Si: ≤ 0.75 Chromium Cr: 19.0 ~ 21.0 nickel Ni ②: 10.0 ~ 12.0 phosphorus P: ≤ 0.045 Sulfur S: ≤ 0.03 Note: ① single value in addition to those indicated are high; ② used in some pipe manufacturing process some models of austenitic stainless steel nickel content must be slightly higher than the table shows the value of 308 Stainless steel used in the production of welding rods 304 compared to my 06Cr19Ni10 Stainless Steel (GB / T 20878-2007).　　Although the kind of rusty steel within the non see, 304 rusty steel name but from the United States. 304 rusty steel this kind of model name, strictly speaking, this 304 rusty steel type name SUS304. market see label 06Cr19Ni10, 304, SUS304 three kinds of, its 06Cr19Ni10 general said standard production, 304 general said ASTM standard production, SUS304 label standard production.　　304 rusty steel type see stainless steel, the industry is called 18/8 stainless steel, high corrosion resistance, processing performance, widely used in industrial furniture decoration industry, food and medical industry, for example: some high-grade stainless steel tableware, bathroom kitchen utensils.