巻号一覧
25 巻, 5 号
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総括木原 博1956 年 25 巻 5 号 p. 242-248
発行日: 1956/04/25
公開日: 2009/12/10
ジャーナル フリーA development research of weldable high tensile manganese silicon structural steels with tensile strengths of 52 to 60 kg/mm2 and with a satisfactory notch toughness, were investigated by the 6th Reseach Committee of the Shipbuilding Research Association of Japan.
Test steels were of nine production heats with the silicon contents varied from 0.1 to 0.6 percents to determine its optimum range. Eithteen kinds of tests ; namely, notch sensitivity tests, bead-bend tests, cracking tests, heat-treatment tests, and etc., were used to evaluate the weldability of test steels, and the correlations among these tests were also studied.
From these studies, the composition limits and necessary properties to be adapted to weldable high tensile manganese silicon structural steels with thichnesses less than 20 mm were determined as follows ;
(a) Chemical composition (Ladle analysis) :
C ≤ 0.18% S ≤ 0.03%
Mn ≤ 1.25% Cu ≤ 0.30%
Si ≤ 0.55% Ni ≤ 0.25%
P ≤ 0.03% Cr ≤ 0.10%
(b) Mechanical properties :
Yield strength ≥ 32 kg/mm2
Tensile strength = 52 to 60 kg/mm2
Elongation (8″) ≥ 20 %
(c) Weldability tests :
i) V-Charpy test
Impact value (at 0°C) ≥ 3.5 kgm/cm2
ii) Austrian test (Kommerell type, longitudinal bead bend test) Max. bend angle ( ≤20°C) ≥120°, and Bend angle at first crack (≤20°C) ≥ 60°Note- Austrian test is only required for plate thichness, 18 to 20 mm, inclusive.抄録全体を表示PDF形式でダウンロード (568K) -
木原 博, 鈴木 春義, 田村 博1956 年 25 巻 5 号 p. 249-253
発行日: 1956/04/25
公開日: 2009/12/10
ジャーナル フリーV-notch Charpy impact tests were performed of 30 ship steel plates which were rolled into 12 or 20mm in thickness from the top and bottom of nine production heats of weldable high strength manganesesilicon steels.
The results of tests may be summarized as follows :
(1) The yield ration was generally 65 percents. However, steels M3 and M6 showed higher ratio of 75% which was comparable to that of German HSB steel.
(2) The notch toughness of test steels in as rolled condition was inferior to that of the current killed ship steels and approximately equal to that of rimmed steels. However, the notch toughness was improved remarkably by normalizing the test steels, and was then superior to that of killed steels.
(3) The notch toughness was almost constant in a range, 0.3 to 0.6%, of silicon content.
(4) The notch toughness of test steels was affected more remarkably by ferrite grain size of distribution of carbide, than by chemical composition.抄録全体を表示PDF形式でダウンロード (380K) -
木原 博, 鈴木 春義, 田村 博1956 年 25 巻 5 号 p. 254-257
発行日: 1956/04/25
公開日: 2009/12/10
ジャーナル フリーV-Charpy impact tests of high tensile manganese-silicon steels were performed over a range of temperature to investigate the effects of normalizing and silicon content on notch toughness.
The conclusions may be summarized as follows :
(1) The improvements in transition temperatures were considerable for silicon-aluminum killed steels, whereas only appreciable for silicon killed steels, K1B, K4B and K4T.
(2) The values of 15 ft-lb transition temperature of silicon-aluminum killed steels were approximately independent of silicon content in a range of 0.30 to 0.60%.
(3) The ductility of test steels, namely elongation and reduction of area in tensile test, was improved considerably by normalizing, whereas the yield point and tensile strength remained almost unaffected.抄録全体を表示PDF形式でダウンロード (308K) -
渡辺 正紀, 出口 義治, 山口 常昭, 森井 春生1956 年 25 巻 5 号 p. 257-260
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーCustomary transition-temperature tests generally require too much material and are very laborious. In a previous report, one of the authors suggested a simple testing method to evaluate the notch toughness of materials, so-called simplified notch toughness test which was based upon the experimental results of structural mild steels. This method uses the properties that the values ofψ(ratio of true stress to strain at the maximum load in atensile test), ψ', ψ and ψ', which are described in the present paper, are constant within the temperature range of -80°C to 100°C and that the material having the smaller values of ψ, ψ', ψ or ψ' shows the lower transition temperature.
The purpose of this report is studying the applicability of above mentioned simplified notch toughness test on various structural high tensile steels.
The test results obtained were almost the same with that shown in the structural mild steels except, the temperature range in which the value of ψ or ψ' is constant as seen in Fig. 9 and Fig. 10. Moreover authors confirmed that ψ or ψ' obtained by room temperature test can be adopted as an index of the notch toughness of high tensile steels.抄録全体を表示PDF形式でダウンロード (266K) -
吉識 雅夫, 金沢 武1956 年 25 巻 5 号 p. 260-264
発行日: 1956/04/25
公開日: 2009/12/10
ジャーナル フリーSchnadt Test of Mn-Si high tensile steels, 12mm thickness, were executed.
The following conclusions are obtained from the test results about the steels tested :
(1) With the exception of K-1, Y-4 and M-8, the notch ductility of the tested steels are excellent. However, it is worth notice that the maximum absorbed energies of N-3 and N-6 are considerably lower than that of the other steels.
(2) There are clear correlations between the transition temperatures obtained by Schnadt and Charpy Test. There are no significant superiority between these two tests.抄録全体を表示PDF形式でダウンロード (338K) -
木原 博, 楠田 忠雄, 飯田 國廣1956 年 25 巻 5 号 p. 264-266
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーFor mild steels it has been recognized that the V-notch Charpy Impact value or the weld heat affected embrittled zone, 10 to 14mm apart from the center of welded bead, is decreased from the value of base metal. This paper deals mainly the experimental study on the similarly embrittled zone in high tensile Mn-Si steels. Standard V-notch Charpy test was employed to evaluate the notch toughness in the embrittled zone in eight high tensile Mn-Si steels, namely N3, N6, K1, K4, M3, M6, Y4 and Y6.
The main conclusions are as follows:—
1. Al inear relationship was found between the degree of embrittlement and the transition temperature of base metal, the higher the embrittlement, the higher the transition temperature.
2. The degree of. embrittlement and the transition temperatures of the tested high tensile Mn-Si steels were lower than that of ordinary mild steels.
3. The maximum temperature attained in the embrittled zone was lower than the Al transformation point.抄録全体を表示PDF形式でダウンロード (216K) -
吉識 雅夫, 金沢 武1956 年 25 巻 5 号 p. 267-272
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーIn order to investigate the notch sensitivity of Mn-Si high tensile steels, we have performed Lehigh Slow Bend Test using specimens with or without weld bead of FL-16 and B-17.
Following results are obtained from the test :
(1) Concerning the notch sensitivity, the tested high tensile steels are superior to the rimmed steels, and they are approximately on the same level or a little inferior to the killed steels.
(2) There is a tendency that the fracture and ductility transition temperatures fall to a lower value as silicon content increases.
(3) The ductility transition temperature of specimens having weld bead is considerably higher than that of without weld bead. However, as to the fracture transition temperature, there is no significant difference between these two kinds of speciment with and without weld bead.
(4) Comparing the results of specimens with weld bead of FL-16 and B-17, there is no significant difference, but FL-16 weld bead shows a little better ductility than B-17 weld bead.
(5) The notch ductility of thicker plates is generally inferior to that of the thinner plates.
(6) There are no significant differences about the test pieces taken from the top or the bottom of ingot.抄録全体を表示PDF形式でダウンロード (462K) -
木原 博, 田村 博, 賀來 信一1956 年 25 巻 5 号 p. 272-276
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーThe bead-bend ductility of high-tensile manganese-silicon steels was investigated by Austrian test, Kommerell type longitudinal bead-bend test. Twelve steel plates of 20mm thickness were tested. As the basic criteria for evaluating steels, (a) the transition temperature at which the maximum bend angle reached at 90 degrees, (b) the maximum bend angle a-id (c) the bend angle at first crack at room temperature were used.
The conclusions may be summarized as follows ;
(1) Bead-bend ductility of test steels were remarkably inferior to that of the current mild ship steels. Therefore, in order to secure a satisfactory service performance of high tensile steels for welded structure, weldability test such as a bead bend ductility test is indispensable.
(2) The maximum bend angle and the bend angle at first crack were closely related to the maximum hardnesses of heat-affected zone, and the both values decreased considerably as the maximum hardness etceeded about 350 VHN.
(3) It was shown that normalizing before welding had not a pronounced effect on bead-bend ductility of test steels, but post-heating above 300°C improved the ductility significantly.抄録全体を表示PDF形式でダウンロード (412K) -
大谷 碧1956 年 25 巻 5 号 p. 277-281
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーUsing slit type specimens, crack tests were performed to evaluate the cracking tendency of structural high tensile Mn-Si steels.
It was found that as the maximum hardness in heat-affected zone (Hmax.) increased the cracking tendency of weld became marked. Cracks usually originated from the root of weld and grew along the heat-affected zone, then turning into the deposit. Hmax. seemed to increase proportionally with C and Mn contents but hardly increased with Si content for the range investigated. To prevent the weld crack C should be kept as low as possible; Mn below about 1.2%. There was not any indication that Si content promoted the craking tendency of weld. Of various types of electrodes applied for the test, the low hydrogen type proved to possess sufficient anti-cracking property.抄録全体を表示PDF形式でダウンロード (2195K) -
増淵 興一, 小椋 陽1956 年 25 巻 5 号 p. 282-285
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーThe purpose of this test was to examine by means of the Lehigh restraint cracking test the effects of type of steel and electrode on crack susceptibility of high strength steel. The Lehigh restraint test is a butt-weld cracking test for comparing quantitatively the degree of restraint at which crack occurs. The results obtained in this test were as follows;
1) The steel Y6B was most crack-insensitive of all steels tested.
2) There seems to exist a linear relationship between the percentage of crack and the value of Tremlett's equivalent carbon, Ceq, which does not contain a term of silicon content.
3) Among those electrodes used LH29 had greater crack susceptibility. The order of the other electrodes was as follows ; LB76, FL76, SL76, HTO52, the latter less cracking. Since this test was performed only once for each condition the effect of restraint on crack susceptibility was not obvious and therefore the degree of critical restraint could not be obtained. Consequently, the mean value of percentages of crack was used in the analysis of experimental results.抄録全体を表示PDF形式でダウンロード (301K) -
中根 金作, 山岸 忠吉1956 年 25 巻 5 号 p. 286-291
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーThe crack sensitity T-tests in accodrance with DIN 50129 and its modification were conducted on the tentative high tensile Mn-Si steels using various types of electrode. Comparisons were made among the test plates and electrodes and they were graded in the order of weldability.抄録全体を表示PDF形式でダウンロード (462K) -
木原 博, 鈴木 春義, 田村 博1956 年 25 巻 5 号 p. 292-296
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーThe effects of ferrite grain sizes and microstructures after various heat treatments on the V-Charpy transition temperatures were investigated with two high tensile Mn-Si steels, of approximately the same chemical comporition, but the one aluminum treated and the other not-treated.
The results obtained are summarized as follows ;
(1) The austenitic grain-coarsening temperature of the Al treated steel N3B was considerably higher than that of Al non-treated steel K1B.
(2) A close relationship was found between the ferrite and the austenite grain sizes after various heat treatments of test steels.
(3) Generally, the transition temperature increased with increasing the austenitizing temperature and with lowering cooling rate.
(4) The greatest difference in transition temperatures between these steels occured after heat treatment at about 950°C at which the difference of austenitic grain sizes was the most significant.
(5) A linear relationship exsisted clearly between the V-Charpy transition temperature and the ferrite grain size.抄録全体を表示PDF形式でダウンロード (5839K) -
大谷 碧1956 年 25 巻 5 号 p. 296-299
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーTensile tests were made on welded butt joints with internal defects (Fig.1). Four charges of structural high tension steels and one mild steel, 20 mm thick, combined with two different types of electrodes were used for the test.
In accordance with the result reported for the mild steel plate, 23mm thick, it was proved that the fracture transition temperature of welded joint (Trs) in this experiment could also be predicted by the similar equation,
TrS=2/3(0.60TrS(B)+0.45TrS(D))-52 (°C)
where TrS(B) and TrS(D) are the 50% shear transition temperatures of base and deposited metals by V-Charpy impact test.抄録全体を表示PDF形式でダウンロード (303K) -
木原 博, 鈴木 春義, 小倉 信和1956 年 25 巻 5 号 p. 300-303
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーThe effects of impact loading on the transition temperatures of notched or unnotched bead bend specimens were investigated with five high tensile steels and the following conclusions were obtained:
1) With unnotched bead bend specimens the absorbed energies were increased and the transition temperatures were decreased by impact loading.
2) The energy transition temperatures of notched bend specimens of base metals were increased considerably by impact loading, and these specimens showed completely brittle fractures in the temperature range of room temperature to -70°C.
3) The rating of notch toughness of the steels by notched bend impact test was remarkably different from that by V-Charpy impact test.抄録全体を表示PDF形式でダウンロード (3405K) -
安藤 良夫1956 年 25 巻 5 号 p. 304-306
発行日: 1956/04/25
公開日: 2009/06/12
ジャーナル フリーWelded joint tests were performed for 8 charges of tentative HT52 high tensile steels, and the results may be summarized as follows:
1. 100% joint efficiency could be obtained for manualy weld with low-hydrogen electrodes, and also for submerged-arc welded joints.
2. Results of bend tests and longitudinal tensile tests showed sufficient ductility of welds.
3. Results of alternative bending fatigue tests were also satisfactory.抄録全体を表示PDF形式でダウンロード (1955K)
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