Qib 420 stainless hlau yog siab - carbon hlau

Stainless hlau qib uas zoo ib yam li qib 420 stainless hlau muaj xws li martensitic steels xws li lwm yam versions ntawm qib 420, muaj vanadium, sulfur thiab molybdenum nyob rau hauv lawv muaj pes tsawg leeg, thiab qib 440 series. Tsis yog- qauv 420C muaj cov ntsiab lus carbon uas siab dua li qib 420.

Martensitic stainless hlau yog cov uas muaj siab hardness thiab siab carbon cov ntsiab lus. Cov hlau no feem ntau yog tsim los ntawm kev siv cov txheej txheem uas yuav tsum tau ua kom tawv thiab tempering kho. Cov kev ua haujlwm ntawm martensitic steels raug cuam tshuam los ntawm kev poob ntawm cov khoom siv lub zog ntawm qhov kub thiab txias, thiab txo cov ductility ntawm qhov kub tsis zoo.

Cov khoom tseem ceeb

Cov khoom nram qab no tau hais rau cov khoom lag luam hauv ASTM A276. Cov kev qhia tshwj xeeb yuav tsis tas yuav zoo sib xws rau lwm cov ntaub ntawv, xws li forgings thiab phaj.

Kev sib xyaw

Qhov sib xyaw ua ke ntawm qib 420 stainless hlau tau muab rau hauv cov lus hauv qab no:

Table 1 - Kev sib xyaw ua ke ntawm qib 420 stainless hlau

Qib		C	Mn	Si	P	S	Cr
420	min. max.	0.15 -	- 1	- 1	- 0.040	- 0.03	12.0 14.0

Mechanical Properties

Cov khoom tseem ceeb ntawm qib 420 stainless hlau yog tabulated hauv qab no:

Rooj 2 - Mechanical zog ntawm qib 420 stainless hlau

Tempering kub (degree)	Tensile zog (MPa)	Yield zog 0.2% Pov thawj (MPa)	Elongation (% hauv 50mm)	Hardness Brinell (HB)	Impact Charpy V (J)
Annealed *	655	345	25	241 max	-
204	1600	1360	12	444	20
316	1580	1365	14	444	19
427	1620	1420	10	461	#
538	1305	1095	15	375	#
593	1035	810	18	302	22
650	895	680	20	262	42
* Annealed tensile zog yog ib yam rau mob A ntawm ASTM A276; annealed hardness yog qhov siab tshaj plaws. # Tempering ntawm cov hlau no yuav tsum tau zam nyob rau hauv thaj tsam 425-600 degree

Lub cev muaj zog

Cov lus hauv qab no muab cov khoom siv lub cev ntawm qib 420 stainless hlau hauv lawv lub xeev annealed:

Table 3 - Lub cev muaj zog ntawm annealed qib 420 stainless hlau

Qib	Qhov ceev (kg / m3)	Elastic Modulus (GPa)	Lub ntsiab lus Coefficient ntawm Thermal Expansion (μm / m / degree)			Thermal conductivity (W/m.K)		Tshwj xeeb kub 0-100degreeC (J/kg.K)	Hluav taws xob tiv thaiv (nΩ)
			0-100 degree	0-315 degree	0-538 ° C	ntawm 100 degree	ntawm 500 degree
420	7800	200	10.3	10.8	11.7	24.9	-	460	550