CN101693327B

CN101693327B - Iron powder electrode deposited metal with high strength and high toughness

Info

Publication number: CN101693327B
Application number: CN2009102100268A
Authority: CN
Inventors: 付学满; 丁永忠
Original assignee: 725th Research Institute of CSIC
Current assignee: 725th Research Institute of CSIC
Priority date: 2009-11-03
Filing date: 2009-11-03
Publication date: 2012-01-25
Anticipated expiration: 2029-11-03
Also published as: CN101693327A

Abstract

The invention belongs to the technical field of welding materials, and specifically introduces an iron powder electrode deposited metal with high strength and high toughness. Ingredients in mass percent include C 0.030 to 0.080, Mn 0.80 to 1.80, Si 0.20 to 0.50, Ni 2.30 to 3.50, Cr 0.10 to 0.25, Mo 0.10 to 0.25, Ti 0.010 to 0.040, S less than or equal to 0.010, P less than or equal to 0.016, the balance of Fe. By using the deposited metal for welding 10CrNi3MoV steels and 10CrNi4MoV steels, the technology is good, yield strength of welded joints is more than 600MPa, elongation percentage is more than 16%, section shrinkage rate is greater than 50%, impact energy under minus 50 DEG C is more than 34J; proportion of welding seam structure acicular ferrite is over 90%; deposition efficiency can be over 130%.

Description

A kind of iron powder electrode deposited metal with high strength and high toughness

Technical field

The present invention relates to a kind of field of welding material technology, particularly a kind of iron powder electrode deposited metal with high strength and high toughness.

Background technology

At present, the stick electrode that China's hull structural steel welding is adopted, the overwhelming majority is the common low alloy structural steel welding rod; Adopt common H08 core wire; The excessive alloying element of coating, the Ni content in the deposited metal are below 1.4%, like the TH907 welding rod of 390MPa, the TH945 welding rod of 440MPa etc.With welding rod research is arranged also for high-tensile structural steel, introduced a kind of welding rod like Chinese patent CN200310100196, its deposited metal yield strength is more than 950MPa, and Mn content is 1.2～1.9%, and the Mo precipitation strength is main, and Mo content is more than 0.66%; Chinese patent CN03104883.8 has introduced a kind of welding rod, and its deposited metal yield strength is more than 760MPa, and Mn content is 1.2～1.6%, and the Mo precipitation strength is main, and Mo content is more than 0.66%; Chinese patent CN200610066049.2 has introduced a kind of welding rod, and its deposited metal yield strength is high Ni welding rod more than 780MPa, and Ni content contains elements such as Co, Nb simultaneously more than 7.1%; Chinese patent CN 200610017847.6 has introduced a kind of welding rod, and its deposited metal yield strength is more than 950Mpa, and Mn, Mo strengthen, and Mn content is 1.2～2.2%, and Mo content is more than 0.60%.These high strength electrodes are not used for the Ship Structure welding at present as yet.At present, contain higher Cr (0.5～1.0%), Mo (0.3～0.6%) in its deposited metal at the V840 welding rod of the yield strength 785MPa of usefulness; The ZS60A welding rod of yield strength 590MPa adopts Ultra-low carbon core wire (C in the core wire≤0.04%), and generally between 0.3～0.55%, Si, Mo content are mostly all below 0.20% for C content in the deposited metal.Above-mentioned welding rod all belongs to the ordinary low-alloy steel stick electrode, and deposition efficiency all is no more than 100%.

Summary of the invention

Technical problem to be solved by this invention is to the 10CrNi3MoV steel that is widely used in present China typical case ship hull structure use high strength steel and consumption is big; Invent a kind of iron powder electrode deposited metal with high strength and high toughness; Realize the high efficiency welding of 10CrNi3MoV Series Steel downhand welding and flat fillet weld, keep weld seam high strength, high tenacity and good comprehensive performances simultaneously.

For the purpose that realizes solving the problems of the technologies described above, the present invention has adopted following technical scheme:

A kind of iron powder electrode deposited metal with high strength and high toughness of the present invention belongs to Mn-Ni-Cr-Mo system, and its chemical composition mass percent is: C:0.030～0.080; Mn:0.80～1.80; Si:0.20～0.50; Ni:2.30～3.50; Cr:0.10～0.25; Mo:0.10～0.25; Ti:0.010～0.040; S≤0.010; P≤0.016; All the other are Fe.

A kind of iron powder electrode deposited metal with high strength and high toughness of the present invention, its preferred chemical composition mass percent are formed can be C:0.036～0.061; Mn:0.972～1.61; Si:0.247～0.432; Ni:2.49～3.27; Cr:0.141～0.215; Mo:0.120～0.156; Ti:0.014～0.028; S≤0.010; P≤0.016; All the other are Fe.

The welding rod that a kind of iron powder electrode deposited metal with high strength and high toughness of the present invention makes is compared with other high-strength steel stick electrode, mainly contains following characteristics:

(1) contains the proper C element;

(2) the Ni constituent content is moderate;

(3) Cr, Mo constituent content are lower;

(4) contain trace Ti.

The effect of above-mentioned these characteristics and selection confirm that principle is:

C in the weld seam can make weld metal keep enough intensity, and can improve the weld seam corrosion resistance.For high strength steel, C content height can make the weldability of steel worsen, and is easy to generate weld crack.Therefore, among the present invention, C content need be controlled as limited element;

Mn not only can improve weld strength as alloy element, and can in welding process, make the weld seam deoxidation, improves the weld seam degree of purity, improves welding point toughness, and therefore, the present invention requires to keep in the deposited metal Mn amount that contains of certain limit;

Si belongs to alloy element, in welding process, participates in deoxidation and alloying, simultaneously to improving weld strength, improving welding procedure property and have benefit.But the Si too high levels can reduce the weld seam low-temperature impact work, and therefore, the present invention also has clearly regulation to the Si content range;

The Cr element can improve weld strength and hardness, improves the weld metal corrosion resistance, but the too high meeting of Cr makes the weld seam embrittlement, cause toughness to descend, so the present invention limits to Cr content;

Ni is as alloying element, and in the low-alloy structural steel welding material, main effect is to improve material plasticity and low-temperature flexibility.But the Ni too high levels can increase the hot cracking tendency of weld seam.The present invention is limited in 2.98～3.27% in order to reach the technical indicator of weld seam high tenacity with Ni content;

Mo not only can improve weld strength within the specific limits, and can crystal grain thinning, improves welding seam toughness.There are some researches show that in the low-alloy steel weld seam, Mo content is 0.2% when following, the effect of crystal grain thinning is the most obvious.Therefore, the present invention is controlled at Mo content in 0.120～0.156% the scope;

Ti can promote the weld seam acicular ferrite to form as micro alloying element, improves low-temperature impact work.Added trace Ti among the present invention, Ti content is limited between 0.014～0.028%;

S, P are objectionable impurities, cause the welding point crackle easily, need strict restriction.S is limited in below 0.010% among the present invention, and P is limited in below 0.016%.

Through adopting technique scheme, the present invention has following beneficial effect:

Adopt a kind of iron powder electrode deposited metal with high strength and high toughness welding 10CrNi3MoV steel of the present invention, 10CrNi4MoV steel; Welding procedure property is good; The deposited metal yield strength is more than 600MPa, and percentage elongation is greater than 16%, and the contraction percentage of area is greater than 50%;-50 ℃ of low-temperature impact works reach more than the 34J, satisfy related standard requirements; The deposited metal tissue is main with acicular ferrite, and its ratio reaches more than 90%; A kind of iron powder electrode deposited metal with high strength and high toughness welding 10CrNi3MoV Series Steel of the present invention; Can realize the high efficiency welding of downhand welding of 10CrNi3MoV Series Steel and flat fillet weld; Deposition efficiency can keep weld seam high strength, high tenacity and good comprehensive performances simultaneously more than 130%.

Description of drawings

Fig. 1 is a kind of iron powder electrode deposited metal with high strength and high toughness weld structure figure of the present invention.

As can be seen from the figure, the weld seam metallographic structure is even, is main with acicular ferrite.

The specific embodiment

Embodiment 1

Adopt the welding rod of this deposited metal composition, supporting core wire adopts H08E, and welding 10CrNi3MoV steel has prepared deposited metal test specimen, has carried out basic performance tests, and the result lists in table 1～table 3.Wherein table 1 is an embodiment deposited metal test plate (panel) welding condition; Table 2 is the deposited metal composition of prescription one to prescription seven; Table 3 is the deposited metal mechanical property of prescription one to prescription seven.

Table 1 embodiment deposited metal test plate (panel) welding condition

Welding current, A	Arc voltage, V	Speed of welding, cm/min	Temperature between the road, ℃
				190±10	24～28	13～17	100±20

Table 2 Example formulations one is to the deposited metal composition of prescription seven

Element	C	Si	Mn	Cr	Ni	Mo	S	P	Ti
										Prescription one	0.049	0.39	1.14	0.190	2.98	0.10	0.0070	0.013	0.040
Prescription two	0.044	0.50	1.25	0.176	3.16	0.124	0.0062	0.016	0.027
										Prescription three	0.047	0.320	1.10	0.193	3.14	0.128	0.0090	0.013	0.020
Prescription four	0.055	0.315	1.80	0.172	3.04	0.150	0.0066	0.015	0.019
										Prescription five	0.061	0.200	1.03	0.215	2.30	0.156	0.0080	0.010	0.015
Prescription six	0.030	0.247	0.972	0.25	3.27	0.128	0.0092	0.015	0.014
										Prescription seven	0.080	0.257	0.80	0.10	3.50	0.25	0.0088	0.014	0.010

Table 3 Example formulations one is to the deposited metal mechanical property of prescription seven

Sequence number	Yield strength/MPa	Tensile strength/MPa	Percentage elongation/%	The contraction percentage of area/%	-50 ℃ of ballistic work/J
						Prescription one	660	745	22.0	71.0	46，70，68/61
Prescription two	650	745	22.0	67.5	122，125，118/121
						Prescription three	650	780	19.5	65.5	73，83，68/74
Prescription four	730	870	17.5	59.5	36，56，57/49
						Prescription five	665	730	22.0	71.5	60，70，44/58
Prescription six	595	665	24.5	73.0	120，130，105/118
						Prescription seven	640	750	18.0	59.0	57，42，83/60

Remarks: the prescription sequence number in correspondence with each other in table 2 and the table 3.

Claims

1. iron powder electrode deposited metal with high strength and high toughness is characterized in that: said iron powder electrode deposited metal with high strength and high toughness belongs to Mn-Ni-Cr-Mo system, and its chemical composition mass percent is: C:0.030～0.044; Mn:0.972～1.25; Si:0.247～0.50; Ni:3.16～3.27; Cr:0.176～0.25; Mo:0.124～0.128; Ti:0.014～0.027; S≤0.010; P≤0.016; All the other are Fe.