Heavy Plates with high strength, high pressure, high temperature in critical hydrogen contacting services. (Hydrogen Heavy Alloy Steel Plate)

•    Due to high technical requirements of anti-corrosion & high temperature & high pressure vessels or equipments for oil/chemistry/coal chemical industry, domestic market depends on importing materials in past years from DillingerHütte GmbH and Kobe Steel Ltd., Japan.

•    XG did preparation on equipments, ingredient design and process for the final production of plates for petroleum chemical industry. We focus on technology research such as smelting, casting, rolling and heat treatment and we finally succeed.

•    J coefficient and vTr 54 + Δ215 vTr 54 data are indispensible indicators. Metal composition should comply with X coefficient also.

•    Key technology of heavy plates for petroleum chemistry is as below:

1. Control of ingredient of P, S, Sn, Sb, As and especially P element and reasonable composition ratio design of Si and Mn .

2. All performance at 1/2 thickness of the plate be realized and well-controlled.

3. Optimized ingredient, reasonable process arrangement and realization of specific application of metallographic structure are assurance of complex mechanical properties, good weld ability and reliable performance.

 

 

•    Rolling Procedures: stable and required properties in the inside and core section of the plate can be achieved through low speed, high pressure rolling mill of 10000 tons  coarse and fine rolling mill so that the pressure and deformation can be reached to the inside of the plates

•    Heat Treatment Procedures and management: the key factors deciding the properties of the high strength, anti corrosion, high temperature proof heavy plate in chemical and petroleum industries depend on its metallographic structure. Thanks to the high toughness, stable structure, thermal fatigue resistance properties of kainite structure, it is desirable to achieve uniformly distributed kainite structure in the whole heavy plates, and it is proven the normalizing quick cooling+tempering  process can achieve ideal plates.

 

 

•    Test results indicate that all mechanic performance is great and mostly even exceed. 

 

 

 

•    Test results indicate that all mechanic performances of 146mm 12Cr2Mo1R (H) plates are great and reach the standards and even exceed required data.

 

 

 

 

Variety	Dimensions	Heat treatment	Location	Hardness(HB)
12Cr2Mo1R(H)	146mm	Delivery status	head	201	205	203	206	202
	146mm		end	203	207	202	205	201
	146mm	Min simulation status after welding	head	195	194	196	195	197
	146mm		end	194	196	195	197	196

Variety	Dimension	Heat treatment	Location	Hardness(HB)
12Cr2Mo1R(H)	146mm	Delivery status	upper  surface	202	207	203	205	204
	146mm		U/S 1/4	195	198	197	196	197
	146mm		1/2	189	190	191	188	192
	146mm		lower r surface	203	205	206	204	207
	146mm		L/S 1/4	196	199	197	196	195

 

Variety	Thickness	Heat treatment	　/B>					Heat treatment	　/B>
			testing temperature	Akv1	Akv2	Akv3	average		test temp.	Akv1	Akv2	Akv3	average
12Cr2Mo1R(H)	146mm	Min simutation after welding	20°C	345	348	342	345	step-cooling testing status	20°C	348	352	350	350
	146mm		0°C	342	329	334	335		0°C	338	335	327	333
	146mm		-20°C	309	322	318	316		-20°C	296	309	315	307
	146mm		-30°C	299	304	308	303		-30°C	289	297	285	290
	146mm		-40°C	266	254	257	259		-40°C	262	258	261	261
	146mm		-60°C	218	205	209	210		-60°C	158	142	120	140
	146mm		-80°C	156	135	141	144		-80°C	65	55	71	63
	146mm		-100°C	39	48	42	43		-100°C	28	35	38	34

  formula:vTr54 +3ΔvTr54

from the chart:vTr54=-96°C,vTr54'=-82°C.

vTr54 +3ΔvTr54=-54°C,10°C lower that the standard requirement.

Variety	thickness	location	organization		crystal size
			1/4t	1/2t	1/4t	1/2t
12Cr2Mo1R(H)	146mm	head	tempered kainite	tempered kainite	8.0	7.5
12Cr2Mo1R(H)	146mm	end	tempered kainite	tempered kainite	8.0	7.5

Variety	Thickness	Location	Place at thickness	A type		B  type		C type		D type
				R/S	F/S	R/S	F/S	R/S	F/S	R/S	F/S
12Cr2Mo1R(H)	146mm	head	upper  surface	0	0.5	0	1	0	0	1	0
	146mm		upper 1/4t	0.5	0	0.5	0.5	0	0	0.5	0
	146mm		1/2t	1	0	0	0.5	0.5	0	0	1
	146mm		lower 1/4t	0	0.5	0.5	0	0.5	0	0	1
	146mm		lowe surface	0.5	0	1	0	0.5	0.5	0	0.5
	146mm	end	upper  surface	0	0	0.5	0	0	0	1	0
	146mm		upper 1/4t	0.5	0	0.5	0	0	0	0	1.0
	146mm		1/2t	0	0.5	0	0.5	0	0	1.0	0
	146mm		lower 1/4t	0.5	0	0.5	0	0	0	0.5	0.5
	146mm		lower surface	0	0.5	0	0	1	0	0	0

Variety	Thickness	Heat treatment	Width place	Z-dirction tensile
				1	2	3	average
12Cr2Mo1R(H)	146mm	delivery status	head	71	65	68	68
	146mm		end	70	71	73	71
	146mm	max simulation status after welding (690±14°C×32h )	head	65	66	68	66
	146mm		end	61	68	67	65
	146mm	min simulation status after welding (690±×8h )	head	72	63	69	68
	146mm		end	69	66	70	68

C	Si	Mn	P	Nb	V	Cr
0.12	0.16	0.34	0.008	0.005	0.004	2.02
Mo	Ni	Ti	Sn	As	Ceq	Pcm
1.03	0.02	0.002	0.0096	0.007	0.96	0.31

	Rel/MPa	Rm/MPa	A/%	AKV   (-30°C)/J
Recorded	506	660	22	293,303,319
Standard	310	520-680	19	34

test point	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17
normal temp.	263	260	257	269	274	267	268	270	323	325	290	292	281	282	270	266	268
100°C	260	261	269	315	310	312	315	305	297	304	311	310	323	314	280	284	263
150°C	286	275	298	296	292	300	299	288	278	276	288	288	289	291	286	281	267
200°C	220	226	219	224	226	225	225	221	229	220	231	229	226	222	231	225	220

thickness	method	equipment	welding material
146mm	SAW	AC/DC1000 LIINCOLN	Wire: CHW-S11,flux CHF101 Pacific Co.
146mm	SMAW	DC400/ LINCOLN	Rod:Φ3.2/4.0mm CHH307/ Pacific co.
(save 1 rolling surface)

board No.	passes	wire diameter	Current  A	Voltage	Speed	Heat input KJ/cm
		mm		V	mm/s
12Cr2Mo1R-11	1	Φ4.0	650	32	5-6	42
	2~65	Φ4.0	700	33	5-6	46
	average					45
12Cr1MoVR-12	1	Φ3.2	110	25		13.4
	2~12	Φ4.0	145-175	26-28		11.1-17.8
	average					15

Welding joints on the set of requirements