630, S17400, 17-4pH, 1.4542, 05Cr17Ni4Cu4Nb Precipitation Hardened Martensite Stainless Steel- SCALE STEEL.

​The Martensite represents steel. It is a ruggediable stainless steel with good corrosion resistance and high mechanical strength through different heat [SCALE STEEL]treatments.
 
Standards:
CHINA GB/T 20878-2007 05Cr17Ni4Cu4Nb
（0Cr17Ni4Cu4Nb）
S51740
AMERICA ASTM A564-2009 630，S17400
AK Steel 17-4 PH®[SCALE STEEL]
JAPAN JIS G4303：2005 SUS 630
GERMANY DIN EN 10088-3：2014 X5CrNiCuNb16-4，1.4542
 
Chemical Composition(%):
GRADE S51740 630 SUS630 1.4542
C ≤0.07 ≤0.07 ≤0.07 ≤0.07
Si ≤1.00 ≤1.00 ≤1.00 ≤0.70
Mn ≤1.00 ≤1.00 ≤1.00 ≤1.50
P ≤0.040 ≤0.040 ≤0.040 ≤0.040
S ≤0.030 ≤0.030[SCALE STEEL] ≤0.030 ≤0.030
Cr 15.0~17.5 15.0~17.5 15.0~17.5 15.0~17.0
Ni 3.00~5.00 3.00~5.00 3.00~5.00 3.00~5.00
Cu 3.00~5.00 3.00~5.00 3.00~5.00 3.00~5.00
Nb 0.15~0.45 Nb+Ta：
0.15~0.45 0.15~0.45 5×C~0.45
Mo -- -- -- ≤0.60

Heat Treatment:(GB/T 1220-2007)
HEAT TREATMENT RP0.2
(MPa) Rm
(MPa) A(%) Z(%) HARDNESS
HBW HRC
SOLID SOLUTION -- -- -- -- ≤363 ≤38
PRECIPITATION HARDENING 480℃
AGING 1180 1310 10 40 ≥375 ≥40
550℃
AGING[SCALE STEEL] 1000 1070 12 45 ≥331 ≥35
580℃
AGING 865 1000 13 45 ≥302 ≥31
620℃
AGING 725 930 16 50 ≥277 ≥28
Note: The classification of heat treatment system in American standard is more detailed: H900, H925, H1025, H1075, H1100, H1150, [SCALE STEEL]H1150M, and H1150D. The four blue characters correspond to the four seasons in the above table respectively.

Characteristics
(1) Good cold, hot processing, welding and casting properties.
(2) Mechanical properties can be improved through heat treatment, tensile strength up to 1100~1300MPa.
(3) Corrosion resistance is better than 400 series stainless steel;In most environments, corrosion resistance is comparable to 304;In [SCALE STEEL]petrochemical industry, food industry, paper industry and other industries, corrosion resistance is the same as 304L grade;In the Marine environment, the 630 is easy to be corroded by seawater and is only suitable for offshore platform.
(4)At a temperature up to 316 C, the corrosion resistance and mechanical properties remain good.

Applications
630 stainless steel is suitable for medium corrosion resistance or super high strength applications, such as: aerospace industrial [SCALE STEEL]parts, nuclear industrial equipment, food processing equipment, chemical processing equipment, petroleum refining equipment, mold parts, etc.