RCCM Composition And Mechanical Properties Of Forgings And Bar Materials_News_Hunan Yushen New Energy Technology Co., Ltd.-Hunan Yushen New Energy Technology Co., Ltd.

RCCM Composition And Mechanical Properties Of Forgings And Bar Materials

2025-07-10
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Source：创始人

China's nuclear power will shift towards a new stage of active and orderly development while ensuring safety. Against the backdrop of carbon peak and carbon neutrality, the process of clean and low-carbon transformation of China's energy and power system will be further accelerated. Nuclear energy, as a nearly zero emission clean energy, will have broader development space and is expected to maintain a fast development trend. China's independent third-generation nuclear power will achieve large-scale and quantitative development according to the approval pace of 6-8 units per year. It is expected that by 2025, China's nuclear power will have an installed capacity of around 70 million kilowatts; By 2030, the installed capacity of nuclear power in operation will reach 120 million kilowatts, accounting for approximately 8% of the country's total electricity generation.

Given the important position and development speed of nuclear power in China's energy structure, especially the significant acceleration of nuclear power construction in the past 10 years, and the increasing demand for stainless steel raw materials for nuclear power, China's current stainless steel materials for nuclear power mainly include the French RCCM standard, the American ASTM standard, and the Chinese GB standard. Currently, China's material standards mainly refer to French material standards and have made some modifications. Here, we mainly introduce the composition and mechanical performance requirements of forging, bar, and fastener raw materials for French nuclear power stainless steel nuclear power materials, mainly covering common non stainless steel materials such as stainless steel austenite, martensite, and precipitation hardening.

The main standard for nuclear power stainless steel materials (forgings, bars, fasteners) is RCCM M3301 RCCM M3306,RCCM M5110,RCCM M5120

Mechanical Performance Requirements After Heat Treatment

Steel Type	Steel Grade	Mechanical Properties Of Austenite (non hardened)
		Room Temperature							350℃
		RP0.2 Mpa	Rm,MPa		A%(5d)		KV,J		RP0.2 Mpa	Rm,MPa
		RP0.2 Mpa	≤150mm	＞150mm	longitudinal	lateral	longitudinal	lateral	RP0.2 Mpa	≤150mm	＞150mm
18-10 steel without Mo	Z6CN18-10	≥210	≥520	≥485	≥45	≥40		≥60	≥125	≥394	≥368
	Z5CN18-10	≥210	≥520	≥485	≥45	≥40		≥60	≥125	≥394	≥368
	Z2CN18-10	≥175	≥490	≥480	≥45	≥40		≥60	≥105	≥350	≥327
	Z2CN18-10(controlled N)	≥210	≥520	≥485	≥45	≥40		≥60	≥125	≥394	≥368
	Z6CN18-11	≥220	≥540	≥490	≥40	≥30	≥100	≥60	≥140	≥365	≥340
	Z8CN18-11	≥220	≥540	≥490	≥40	≥30	≥100	≥60	≥135	≥425	≥397
18-10 steel with Mo	Z6CND17-12	≥210	≥520	≥485	≥45	≥40		≥60	≥130	≥445	≥416
	Z5CND17-12	≥210	≥520	≥485	≥45	≥40		≥60	≥130	≥445	≥416
	Z2CND17-12	≥175	≥490	≥450	≥45	≥40		≥60	≥105	≥382	≥355
	Z6CND18-12	≥220	≥520	≥485	≥45	≥40		≥60	≥130	≥445	≥416
	Z8CNDT18-12	≥230	≥540	≥490	≥35	≥30	≥100	≥60	≥150	≥365	≥340
	Z8CNDTb18-12	≥230	≥540	≥490	≥35	≥30	≥100	≥60	≥150	≥425	≥397
X6NiCrTiMoVB25-15-2		≥600	900-1200		A%(5d)≥15 HB:248-341 Z%≥35 AKV≥50					RP0.2 Mpa≥555

Steel Grade	Mechanical Properties Of Martensite
	Room Temperature
	Rp0.2.Mpa	Rm.MPa	A%(5d)	Z%(1)	KV,J 0℃	Hardness Room Temperature	RtP0.2.Mpa 350℃
X12Cr13	590	760-960	≥15	≥50	40	228-285	≥490
X12CrNi13	590	760-960	≥15	≥50	60	228-285	≥490
X12CrNiMoV12-3	700	850-1050	≥15	/	40	/	≥570
X6CrNiMo16-04	700	900-1050	≥16	≥45	60	/	≥585

Steel Grade	Mechanical Properties Of Precipitation Hardening
	Room Temperature 350°	After Aging And hardening Treatment
	Room Temperature 350°	Screw Class A	Valve Stem Class A	Valve Stem Class B
XCrNiCu17-04 And X6CrNiCuMo15-04	Rp0.2.Mpa	≥790	≥790	≥700
	Rm,MPa	≥960	≥960	≥930
	A%(5d)	≥14	≥14	≥16
	Z%(1)	≥45	≥35	≥35
	RP0.2,MPa	≥630	≥630	≥580
	KV,J	60	60	60
	KV,J	40	40	40