Product Name: carbon tool steel Model: T11 Standard: GB / T 1298-1986 ● Delivery status: Delivery of steel in the annealed condition. By mutual agreement, can not annealed state delivery. Edit this paragraph the chemical composition 
 Carbon C: 1.05 ~ 1.14 Si Si: ≤ 0.35 Manganese Mn: ≤ 0.40 S S: ≤ 0.030 P P: ≤ 0.035 Chromium Cr: agreed residual content ≤ 0.25, ≤ 0.10 (manufacture of lead wire when the quenching bath) Ni: to agree the residual content of ≤ 0.20, ≤ 0.12 (when the manufacture of lead-bath quenching wire) copper Cu: residual content promised ≤ 0.30, ≤ 0.20 ( manufacture of lead wire when the quenching bath) Note: The agreed content of the residual Cr Ni Cu ≤ 0.40 (when the manufacture of lead-bath hardening steel) Edit the mechanical properties of this paragraph 
 Hardness: Annealed state, ≤ 207HB, indentation diameter ≥ 4.20mm; quenching, ≥ 62HRC edit this paragraph Heat Treatment 
 Heat treatment specifications: the sample quenching 760 ~ 780 ℃, water-cooled. 
 Tempering process 
 T11 steel tempered recommended use of standard program tempering heating temperature / ℃ heating medium hardness (HRC) 
 Ⅰ eliminate stress, stability, organization and size of 140 ~ 160 
 160 ~ 180 
 180 ~ 200 
 Oil 200 250 62 64 or alkali nitrate 
 61 ~ 63 
 60 ~ 62 
 56 ~ 61 
 Ⅱ eliminate stress, reduce the hardness, toughness and plasticity see Note 2 nitrate, alkali 
 See Note 2 air furnace 
 Note: 1. High-precision parts (1 ~ 2μm), the coarse grinding process, it should be re-tempering (aging); 2 tempering hardness less than HRC56 specifications, choose Figure 2-22-15; 3. higher than the tempering temperature of 250 ℃, it could also ensure the stability of the workpiece size.