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牌號	X2CrNiMo18-15-4
	1.4438
對應標準	NF EN 10028-7-2000 壓力容器用不銹鋼扁平產品 Flat products made of steels for pressure purposes Part 7: Stainless steels
歸類	奧氏體不銹鋼
標簽	特殊等級

X2CrNiMo18-15-4 化學元素成分含量(%)

成分	C	Si	Mn	P	S	Cr	Ni	Mo	N
最小值	-	-	-	-	-	17.5	13	3	-
最大值	0.03	1	2	0.045	0.015	19.5	16	4	0.11

◎ 未經買方同意，不得隨意向鋼中添加表中未列的元素，冶煉精加工除外。采取一切必要措施以防在廢鋼和生產原料中帶入這些元素，因為其會削弱鋼的機械性能，降低鋼的適用性。

碳當量計算

X2CrNiMo18-15-4 機械性能

條件	熱處理或狀態	抗拉強度 σ_b Mpa	屈服點 σ_s Mpa	斷后伸長率或延伸率 δ %	沖擊吸收能量 KV2 J
C：T ≤ 6	+AT	550~700	R_p0.2：≥240 R_p1.0：≥270 ①②	T ＜ 3mm: ≥35 T ≥ 3mm: ≥ 35 ②③	20℃： (l: ≥100；t: ≥60) -196℃： (t: ≥60)
H：T ≤ 12	+AT	550~700	R_p0.2：≥220 R_p1.0：≥260 ①②	T ＜ 3mm: ≥35 T ≥ 3mm: ≥ 35 ②③	20℃： (l: ≥100；t: ≥60) -196℃： (t: ≥60)
P：T ≤ 75	+AT	520~720	R_p0.2：≥220 R_p1.0：≥260 ①②	T ＜ 3mm: ≥40 T ≥ 3mm: ≥ 40 ②③	20℃： (l: ≥100；t: ≥60) -196℃： (t: ≥60)

◎C- 冷軋帶鋼; H- 熱軋帶鋼; P- 熱軋中厚板；T- 厚度；t- 橫向；l-縱向。
◎+A=軟化退火；+AT=固溶退火；+QT=淬火及回火；+RA=再結晶退火。

◎ 如果熱加工和隨后冷卻的條件符合ENISO3651-2中對產品機械性能和抗晶間腐蝕性的要求，則可以省略固溶處理。
*抗晶間腐蝕根據EN ISO 3651-2進行測試。在交貨條件下：有；在致敏狀態下：有。
① 對于連續熱軋產品，可在詢價和訂購時商定Rp0.2(即表中σs)的最小值提高20MPa，Rp1.0的最小值提高10MPa。
② 如果在軋制寬度<300mm的帶材情況下，采用縱向試驗件，最小值減小如下:屈服強度-15MPa，恒定標距的延伸率-5%，比例標距延伸率-2%。
③ T＜3mm：該值適用于標距為80mm、寬度為20mm的試件，也可以使用標距為50mm、寬度為12.5mm的試件。T ≥3mm：該值適用于標距為5.65√S的試件。

高溫下的最小屈服強度

Material designation		Heat treatment condition	Minimum 0.2% proof strength R_p0.2,MPa at a temperature (in°C) of:
Name	Number	Heat treatment condition	100	150	200	250	300	350	400	450	500	550	600
X2CrNiMo18-15-4	1.4438	+AT	172	157	147	137	127	120	115	112	110	108	-
			Minimum 1.0% proof strength R_p1.0,MPa at a temperature (in°C) of:
			100	150	200	250	300	350	400	450	500	550	600
			206	188	177	167	156	148	144	140	138	136	-

高溫下的最小抗拉強度

Material designation Minimum tensile strength R_m,MPa
at a temperature (in°C) of:
Name Number 100 150 200 250 300 350 400 450 500 550 600
X2CrNiMo18-15-4 1.4438 430 410 390 385 380 380 - - - - -

熱處理指南

Material designation		Hot forming		Heat treatment symbol	Solution anneailing ①②		Post weld heat treatment steels with ≤ 0.07% C
Name	Number	Temperature ℃	Type of cooling	Heat treatment symbol	Temperature ℃ ③④	Type of cooling	Temperature ℃ ⑥	Type of cooling
X2CrNiMo18-15-4	1.4438	1150 to 850	air	+AT	1070 to 1150	water,air ⑤	960 to 1040 ⑦	forced air

◎ a=air; o=oil; w=water.
◎ Scale and annealing colours produced during hot forming, heat treatment or welding may adversely affect the corrosion resistance. They should be removed as far as possible before use, e.g. by pickling.
◎ The temperatures of annealing should be agreed for simulated heat treated test pieces.
① The solution treatment may be omitted if the conditions for hot working and subsequent cooling are such that the requirements for the mechanical properties of the product and the resistance to intergranular corrosion as defined in EN ISO 3651-2 are obtained and provided these requirements are met even after appropriate subsequent solution annealing.
② Re-crystallizing annealing.
③ If heat treatment is carried out in a continuous furnace, the upper part of the range specified is usually preferred, or even exceeded.
④ The lower end of the range specified for solution annealing should be aimed at for heat treatment as part of further processing,because otherwise the mechanical properties might be affected. If the temperature of hot forming does not drop below the lower temperature for solution annealing.a temperature of 980℃ is adequate as a lower limit for Mo-free steels,a temperature of 1000℃ for steels with Mo contents up to 3% and a temperature of 1020℃ for steets with Mo contents exceeding 3%.
⑤ cooling sufficiently rapid.

⑥ Minimum holding time:30min.

⑦ Not recommended if welded with stabilized filler medal.

X2CrNiMo18-15-4 對應不同標準

1	EN 10088-1-2005 不銹鋼第1部分:不銹鋼的清單
	X2CrNiMo 18-15-4 1.4438
2	EN 10253-4-2003 對接焊管道接頭.具有特殊檢驗要求的鍛制奧氏體和鐵素體－奧氏體(二相)不銹鋼
	X2CrNiMo18-15-4 1.4438
3	EN 10088-3-2005 不銹鋼第3部分：一般用途的半成品，鋼棒，軋制線材和型鋼的交貨條件
	X2CrNiMo 18-15-4 1.4438
4	EN 10088-3-2014 不銹鋼 - 第3部分：半成品，棒材，桿材，線材，型材和光亮產品的一般用途耐腐蝕鋼的交貨技術條件
	X2CrNiMo 18-15-4 1.4438
5	ISO 9328-7-2018 不銹鋼承壓扁鋼制品
	X2CrNiMo18-15-4
6	DIN EN 10088-3-2014 不銹鋼-半成品、棒材、桿材、線材、型材及光亮產品交貨技術條件
	X2CrNiMo 18-15-4 1.4438
7	NF EN 10088-2-2005 普通用途不銹鋼板和鋼帶的交貨技術條件
	X2CrNiMo18-15-4 1.4438
8	NF EN 10088-1-2005 不銹鋼 - 第1部分：不銹鋼清單
	X2CrNiMo18-15-4 1.4438
9	NF EN 10028-7-2008 壓力容器用不銹鋼扁平產品
	X2CrNiMo18-15-4 1.4438
10	NF EN 10028-7-2000 壓力容器用不銹鋼扁平產品
	X2CrNiMo18-15-4 1.4438

注：數據僅供參考！如有疑問，請填寫"我要糾錯"！

Material designation		Minimum tensile strength R_m,MPa at a temperature (in°C) of:
Name	Number	100	150	200	250	300	350	400	450	500	550	600
X2CrNiMo18-15-4	1.4438	430	410	390	385	380	380	-	-	-	-	-

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高溫下的最小屈服強度

高溫下的最小抗拉強度

熱處理指南