630

HuaNickel17-4 stainless steel is an age-hardened martensitic stainless steel that combines high-strength and corrosion-resistant stainless steel. Hardening is done by a short, simple low-temperature treatment. Unlike traditional martensitic stainless steels, such as Type 410, Type 17-4 is quite weldable. Its strength, corrosion resistance, and simplified manufacturing process can make HuaNickel 17-4 stainless steel a cost-effective alternative to high-strength carbon steel and other stainless steel grades. At a solution treatment temperature of 1900°F, the metal is austenite, but transforms into a low-carbon martensitic structure during cooling to room temperature. This conversion will not be completed until the temperature drops to 90° Fahrenheit. It is then heated to 900-1150°F for 1 to 4 hours of precipitation to strengthen the alloy.

630Chemical composition：

	Fe	Ni	Cr	Mo	Mn	Cu	Si	C	Cb+Ta	S	P
Min	Bal	3	15	–	–	3	–	–	5 x C	–	–
Max		5	17.5	0.5	1	5	1	0.07	0.45	0.03	0.04

630Physical properties：

Density	Melting point	Poisson’s ratio	Resistivity
0.282 lb/in3	2560-2625°F	0.272	463 Ohm-circ mil/ft

630Mechanical properties：

condition	H900	H925	H1025	H1075	H1100	H1150	H11500	H1150-M
Ultimate tensile strength, ksi	200	190	175	165	150	145	140	125
0.2% yield strength, ksi	185	175	165	150	135	125	120	85
Elongation 2″, %	14	14	15	116	17	19	22	22
Reduced Area, %	50	54	56	58	58	60	65	68
Hardness, Brinell	420（C44）	409（C42）	352（C38）	341（C36）	332（C35）	311（C33）	294（C31）	277（C27）
Impact Charpy V-notch, one foot-pound	15	25	35	40	45	50	55	100

630Stainless steel characteristics：

High tensile strength and hardness to 600°F

Corrosion-resistant

Excellent oxidation resistance, about 1100°F

Creep rupture strength is 900°F

630Uses of stainless steel：

Gate valve

Chemical processing equipment

Pump shafts, gears, plungers

Stems, spherical stems, bushings, seats

Fasteners

630Process performance：

Heat treatment:

name	Processing
ConditionA**	Heat at 1900°F + 25°F for 1/2 hour, air (solution treatment) cool or cool down to below 90°F. It is usually done on a grinder.
H900	Conditions: A material is heated at 900°F + 15°F for 1 hour and cooled by air. Maximum hardness, but lower toughness. Sensitive to stress corrosion cracking. Heating for 4 hours improves toughness and reduces tensile and flexion by about 4 ksi.
H925, H1025, H1075, H1100, H1150	Condition: A material is heated at a specific temperature for 4 hours and then cooled by air.。
H1150D	Condition A material is heated at 1150°F for 4 hours with air cooling and reheated at 1150°F for another 4 hours with air cooling.
H1150-M	Condition: A material is heated at 1400°F + 25°F for 2 hours, air cooled, then heated at 1150°F + 15°F for 4 hours, then air-cooled.

Relevant standards：

ASTM: A 693, A 564, A 705, Type 630 AMS: 5604, 5643, 5825

ASME: SA 693, SA 564, SA 705, Type 630 NACE: MR0175 ISO: 15156-3