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standard & specification

 
DIN 17175 Seamless Tubes of Heat-resistant Steel

DIN 17175 6.3 Delivery conditions

The tubes shall e supplied suitably heat treated over their entire length. The following heat treatment shall be used, depending on the type of steel: --normalizing --sueritical annealing --hardening and tempering with continous cooling from the hardening temperature and subsequent tempering --hardening and tempering with isothermal transformation.

The condition for an efficient heat treatment is regarded as satisfied in the cases of the steels St35.8, St 45.8, 17Mn4, 19Mn5 and 15Mo3, if hot workig guarantees a good and resonably uniform structure. Under identical conditions tempering istead of hardening plus tempering may be adequate for steels 13CrMo44 and 10CrMo910. Steel 14 MoV63 and X20CrMoV12 1 must always be supplied in the hardened and tempered conditions.

Grade Chemical composition(%)
C Si Mn P S Cr Mo
St35.8 0.17Max 0.10~0.35 0.40~0.80 0.040Max 0.040Max - -
St45.8 0.21Max 0.10~0.35 0.40~1.20 0.040Max 0.040Max - -
17Mn4 0.14~0.20 0.20~0.40 0.90~1.20 0.040Max 0.040Max 0.30Max -
19Mn5 0.17~0.22 0.30~0.60 1.00~1.30 0.040Max 0.040Max 0.30Max -
15Mo3 0.12~0.20 0.10~0.35 0.40~0.80 0.035Max 0.035Max - 0.25~0.35
13CrMo910 0.10~0.18 0.10~0.35 0.40~0.70 0.035Max 0.035Max 0.70~1.10 0.45~0.65
10CrMo910 0.08~0.15 0.50Max 0.40~0.70 0.035Max 0.035Max 2.00~2.50 0.90~1.20
14MoV63 0.10~0.18 0.10~0.35 0.40~0.70 0.035Max 0.035Max 0.30~0.60 0.50~0.70
X20CrMoV121 0.17~0.23 0.50Max 0.40~0.70 0.030Max 0.030Max 10.00~12.50 0.80~1.20

14MoV63 V : 0.22~0.32
X20CrMoV121 Ni 0.30~0.80V : 0.25~0.35

Grade Materianumber Tensile Test MPa or N/mm2 Remaks(Similar to JIS) Possibility Temperature
Min Yield point Tensile Strength

t16Max

16<t40Max

St35.8 1.0305 235 225 360~480 Impact Test at Room Temp.kgf-m
(STPT38)
 
St45.8 1.0405 - 245 410~530 23.5(STPT410, STB410)  
17Mn4 1.0481 - 275 460~580 22.8  
19Mn5 1.0482 - 315 510~610 23.5(STB52)  
15Mo3 1.5415 275 275 450~600 23.5  
13CrMo910 1.7335 295 295 440~590 23.2(STPA22, STBA22)  
10CrMo910 1.7380 285 285 450~600 23.2(STPA24, STBA24)  
14MoV63 1.7715 325 325 460~610 24.2  
X20CrMoV121 1.4922 490 490 690~850 23.5  
 
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