The Martensite represents steel. It is a ruggediable stainless steel with good corrosion resistance and high mechanical strength through different heat [TJC STEEL]treatments.

 

Standards:

CHINA	GB/T 20878-2007	05Cr17Ni4Cu4Nb （0Cr17Ni4Cu4Nb） S51740
AMERICA	ASTM A564-2009	630，S17400
	AK Steel	17-4 PH®[TJC 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[TJC 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[TJC STEEL]	1000	1070	12	45	≥331	≥35
	580℃ AGING	865	1000	13	45	≥302	≥31
	620℃ 时效	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, [TJC 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 [TJC 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 [TJC STEEL]parts, nuclear industrial equipment, food processing equipment, chemical processing equipment, petroleum refining equipment, mold parts, etc.