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Hollow Bars
Hollow Bars from ISMT (Conforming to EN 10294 - 1)
If you are a user of Hollow Bar, our products are sure to interest you. We are setting new industry benchmarks in the production of Hollow Bars. ISMT produces Hollow Bars to the tightest tollerances & the highest quality standards in the industry. This means, as a customer you get more length (meters) and therefore more finished product per tonne of Hollow Bar that you purchase. This also means our Hollow Bars cost less to machine than our competitors.

TOTAL PROCESS CONTROL
At ISMT, we believe the only way to guarantee quality is to stand responsible for the entire production process. For that reason we start with producing all our steel in-house. We bring to bear over 20 years of experience in manufacturing high-grade Bearing Steel to all our manufacturing processes and to all our steel products (we are among a few select manufacturers globally to be approved by SKF and FAG for the supply of Bearing steels).

We produce our steel through the electric arc furnace route. The raw material mix is chosen and prepared carefully to ensure the highest standards of cleanliness. All heats are ladle refined and vacuum degassed before continuous casting and rolling. Right through the production process, we maintain full traceability of the material and a record of the tightly controlled process parameters. This ultra-clean steel forms the starting point for the manufacture of our tubes and hollow bars.

The manufacture of precision seamless tubes is as much a matter of equipment as it is of experience and process technology. We believe in investing in the finest of equipment. For making seamless tubes, we operate three Assel Mills, one PQF Mill, Pilger Mills and Cold Draw Benches. Our tube-mills are imported from Shloemann Mannesman in Germany and incorporate the best in technology. With regards to experience, our team is amongst the most technically qualified anywhere in the world – the hollow bars that we produce for the mechanical industry reflects this experience.
CLEAN TURNED SIZE
ISMT Hollow Bars conform to European EN 10294-1 standards. The Clean Turned Size refers to the finished machined size that is guaranteed to be produced by chucking the Hollow Bar on the OD. Each Clean Turned Size, defined in steps of 5, 10 or 20 mm corresponds to a delivered hollow bar size. The difference in these two sizes represents the material that needs to be machined off.

TIGHTER TOLERANCES = SAVINGS
ISMT offers the tightest tolerances in the industry. We are able to do so through stringent control of our process parameters and because of proprietary processes that we have developed. With over 25 years of experience in operating Assel Mills, we have a complete understanding of the primary parameters that are responsible for variations in product quality and we are able to control these parameters very carefully. Similarly, we have developed special surface treatment and cold sizing processes that allow us to ensure extremely good dimensional control as well as surface cleanliness. In case of Hollow Bars, tighter tolerances translate directly into cost savings.

In order to guarantee a clean turned size, we are able to provide a finer machining allowance than our competitors. This not only means that you have less material to machine but also you get a greater number of finished components per tonne of hollow bars that you purchase.

HIGHLY MACHINABLE STEEL
With over 25 years of experience in the Mechanical Tubes business, we fully understand that machinability and weldability of our tubes is of the essence to our customers. Therefore, we have invested vast efforts in developing and perfecting the “SpeedCut™” grades of steel.
 
TAYLOR CURVES
Our Hollow Bars are regularly put through testing procedures to benchmark machinability of the steel. The standard procedure used is to generate Taylor Curves for steel (as per ISO 3685 – 1993) which provide a proxy measure of tool life as a function of the cutting speeds employed while machining the steel.

The graph below demonstrates the standard Taylor Curve for the SpeedCut™ grade as compared to the requirements as per EN 10294-1 standard.
 
 
 
GRADES
ISMT produces four standard grades of SpeedCut™ Hollow Bar: three micro-alloyed grades (470, 420, 590) and one regular grade (355). Although, the three micro-alloyed grades share the same chemistry they differ in their heat treatments.
 
CHEMICAL ANALYSIS
Speedcut Grade C Mn Si P S AI V
470, 420, 590 < 0.22 < 1.70 < 0.5 < 0.025 0.020 - 0.035 0.020 - 0.035 0.08 - 0.15
355 < 0.22 < 1.60 < 0.55 < 0.030 0.015 - 0.050    
 
MECHANICAL PROPERTIES
The Mechanical properties of EN-10294-1:2005 (E)
 
Steel Grade Upper yield strength ReH min
Mpa For TN in mm
Tensile strength Rm min Mpa
For TN in mm
Elongation in
the longitudinal
direction
A min %
Minimum average
absorbed energy KV,
in, J at a test
temperature of - 20º c
Name Number TN<=16 16< TN<=25 25< TN<=40 40< TN<=50 TN< =16 16< TN<=25 25< TN<=40 40< TN<=50    
355 1.0580 355 345 335 335 490 490 470 470 18 -
355 J2 1.0592 355 345 335 335 490 490 470 470 20 27
420 J2 1.0599 420 400 380 380 600 560 530 530 19 27
470 1.0536 470 460 430 430 650 620 600 550 17 -
E590K2 1.0644 590 540 480 480 700 650 570 570 16 40
 
* At the discretion of the manufacturer the elongation may also be determined in the transverse direction.
In this case the minimum values to be achieved to be achieved shall be those for the longidinal direction minus 2 points
 
WELDABILITY
We assure a Ceq of less than 0.57 and thereby guarantee weldability. Nevertheless , as a practice, we recommend the following :

For tubes of thickness > 16 mm: Pre-heating between 200° and 250° C
For tubes of thickness < 16 mm: Pre-heating between 100° and 120° C

Stress Relieving at 600° C
 
HEAT TREATMENTS
Approximate transformation temperatures are as follows :
Transformation Temp SPEEDCUT 420, 470, 590 SPEEDCUT 355, 355J2
Acl 720°c 715°c
Ac3 815°c 810°c
Austenitisation 880°c 880°c
 
We also delivery Hollow Bars in quench & tempered conditions, customized to specific needs.
 
SIZES AS PER EN 10294-1
The following tables show the finished machined sizes (guaranteed clean turned size with OD chucking), the delivered sizes (OD, Wall Thickness), weight per meter, and the guaranteed clean turned size if chucked on the ID.
 
Dimensions for OD chucking
1 3015 CDS 30 15 31.150 30.150 9.394 7.306 4.594
2 3020 CDS 30 20 31.150 30.150 6.581 5.199 3.579
3 3520 CDS 35 20 36.150 35.150 9.394 7.306 5.624
4 3525 CDS 35 25 36.150 35.150 6.581 5.119 4.301
5 4020 CDS 40 20 41.150 40.150 12.206 9.494 7.977
6 4025 CDS 40 25 41.150 40.150 9.394 7.306 6.654
7 4030 CDS 40 30 41.150 40.150 6.581 5.119 5.022
8 4530 CDS 45 30 46.150 45.150 9.394 7.306 7.684
9 4535 CDS 45 35 46.150 45.150 6.581 5.119 5.744
10 5030 CDS 50 30 51.200 50.200 12.263 9.538 10.702
11 5035 CDS 50 35 51.200 50.200 9.450 7.350 8.766
12 5040 CDS 50 40 51.200 50.200 6.638 5.163 6.521
13 5530 CDS 55 30 56.200 55.200 15.075 11.725 13.983
14 5535 CDS 55 35 56.200 55.200 12.263 9.538 12.047
15 5540 HFS 55 40 56.650 55.650 10.322 8.028 10.633
16 5545 HFS 55 45 56.650 55.650 7.791 6.059 8.410
17 6035 CDS 60 35 61.200 60.200 15.075 11.725 15.636
18 6040 HFS 60 40 61.650 60.650 13.134 10.216 14.250
19 6045 HFS 60 45 61.650 60.650 10.322 8.028 11.764
20 6050 HFS 60 50 61.650 60.650 7.509 5.841 8.971
21 6535 CDS 65 35 66.200 65.200 17.409 14.310 19.534
22 6540 HFS 65 40 66.650 65.650 15.947 12.403 18.176
23 6545 HFS 65 45 66.650 65.650 13.134 10.216 15.690
24 6550 HFS 65 50 66.650 65.650 10.322 8.028 12.896
25 6555 HFS 65 55 66.650 65.650 7.791 6.059 10.118
26 7040 HFS 70 40 71.650 70.650 18.618 15.233 22.641
27 7045 HFS 70 45 71.650 70.650 15.947 12.403 19.924
28 7050 HFS 70 50 71.650 70.650 13.134 10.216 17.130
29 7055 HFS 70 55 71.650 70.650 10.322 8.028 14.028
30 7060 HFS 70 60 71.650 70.650 7.791 6.059 10.972
31 7545 HFS 75 45 76.721 75.579 18.343 15.008 24.466
32 7550 HFS 75 50 76.721 75.579 15.947 12.403 21.672
33 7555 HFS 75 55 76.721 75.579 13.134 10.216 18.570
34 7560 HFS 75 60 76.721 75.579 10.322 8.028 15.160
35 8040 HFS 80 40 81.910 80.690 24.200 19.800 32.184
36 8045 HFS 80 45 81.910 80.690 21.450 17.550 29.730
37 8050 HFS 80 50 81.910 80.690 18.425 15.075 26.674
38 8055 HFS 80 55 81.910 80.690 16.031 12.469 23.571
39 8060 HFS 80 60 81.910 80.690 13.219 10.281 20.161
40 8545 HFS 85 45 86.947 85.653 24.200 19.800 34.898
41 8550 HFS 85 50 86.947 85.653 21.450 17.550 32.135
42 8555 HFS 85 55 86.947 85.653 18.425 15.075 28.740
43 8560 HFS 85 60 86.947 85.653 16.031 12.469 25.329
44 8565 HFS 85 65 86.947 85.653 13.219 10.281 21.610
45 8570 HFS 85 70 86.947 85.653 10.406 8.094 17.583
46 9045 HFS 90 45 91.985 90.615 26.950 22.050 40.375
47 9050 HFS 90 50 91.985 90.615 24.200 19.800 37.612
48 9055 HFS 90 55 91.985 90.615 21.175 17.325 34.216
49 9060 HFS 90 60 91.985 90.615 18.425 15.075 30.806
50 9065 HFS 90 65 91.985 90.615 16.031 12.469 27.087
51 9070 HFS 90 70 91.985 90.615 13.219 10.281 23.059
52 9075 HFS 90 75 91.985 90.615 10.688 8.313 19.171
53 9545 HFS 95 45 97.022 95.578 29.700 24.300 46.160
54 9550 HFS 95 50 97.022 95.578 26.950 22.050 43.397
55 9555 HFS 95 55 97.022 95.578 24.200 19.800 40.326
56 9560 HFS 95 60 97.022 95.578 21.175 17.325 36.591
57 9565 HFS 95 65 97.022 95.578 18.425 15.075 32.872
58 9570 HFS 95 70 97.022 95.578 16.031 12.469 28.844
59 9575 HFS 95 75 97.022 95.578 13.219 10.281 24.509
60 9580 HFS 95 80 97.022 95.578 10.688 8.313 20.343
61 10050 HFS 100 50 102.513 100.987 30.278 24.773 50.402
62 10055 HFS 100 55 102.513 100.987 27.528 22.523 47.367
63 10060 HFS 100 60 102.513 100.987 24.503 20.048 43.673
64 10065 HFS 100 65 102.513 100.987 21.753 17.798 39.991
65 10070 HFS 100 70 102.513 100.987 19.003 15.548 36.001
66 10075 HFS 100 75 102.513 100.987 16.622 12.928 31.702
67 10080 HFS 100 80 102.513 100.987 13.809 10.741 27.095
68 10085 HFS 100 85 102.513 100.987 11.278 8.772 22.685
69 10550 HFS 105 50 107.551 105.949 33.028 27.023 56.831
70 10555 HFS 105 55 107.551 105.949 30.278 24.773 53.797
71 10560 HFS 105 60 107.551 105.949 27.528 22.523 50.454
72 10565 HFS 105 65 107.551 105.949 24.503 20.048 46.421
73 10570 HFS 105 70 107.551 105.949 21.753 17.798 42.431
74 10575 HFS 105 75 107.551 105.949 19.003 15.548 38.132
75 10580 HFS 105 80 107.551 105.949 16.622 12.928 33.525
76 10585 HFS 105 85 107.551 105.949 13.809 10.741 28.609
77 10590 HFS 105 90 107.551 105.949 11.278 8.772 23.922
78 11060 HFS 110 60 112.558 110.912 30.278 24.773 57.192
79 11065 HFS 110 65 112.558 110.912 27.253 22.298 53.159
80 11070 HFS 110 70 112.558 110.912 24.503 20.048 49.169
81 11075 HFS 110 75 112.558 110.912 21.753 17.798 44.870
82 11080 HFS 110 80 112.558 110.912 19.003 15.548 40.263
83 11085 HFS 110 85 112.558 110.912 16.622 12.928 35.347
84 11090 HFS 110 90 112.558 110.912 13.809 10.741 30.123
85 11095 HFS 110 95 112.558 110.912 11.278 8.772 25.158
86 11565 HFS 115 65 117.626 1.15.874 30.278 24.773 60.588
87 11570 HFS 115 70 117.626 1.15.874 27.253 22.298 56.215
88 11575 HFS 115 75 117.626 1.15.874 24.503 20.048 51.916
89 11580 HFS 115 80 117.626 1.15.874 21.753 17.798 47.309
90 11585 HFS 115 85 117.626 1.15.874 19.003 15.548 42.394
91 11590 HFS 115 90 117.626 1.15.874 16.622 12.928 37.170
92 11595 HFS 115 95 117.626 1.15.874 13.809 10.741 31.638
93 12070 HFS 120 70 122.865 121.035 30.388 24.863 64.283
94 12075 HFS 120 75 122.865 121.035 27.363 22.388 59.572
95 12080 HFS 120 80 122.865 121.035 24.613 20.138 54.965
96 12085 HFS 120 85 122.865 121.035 21.863 17.888 50.049
97 12090 HFS 120 90 122.865 121.035 19.113 15.638 44.825
98 12095 HFS 120 95 122.865 121.035 16.734 13.016 39.293
99 120100 HFS 120 100 122.865 121.035 14.203 11.047 34.050
100 12570 HFS 125 70 127.902 125.998 33.138 27.113 71.959
101 12575 HFS 125 75 127.902 125.998 30.113 24.638 67.247
102 12580 HFS 125 80 127.902 125.998 27.363 22.388 62.640
103 12585 HFS 125 85 127.902 125.998 24.613 20.138 57.724
104 12590 HFS 125 90 127.902 125.998 21.863 17.888 52.501
105 12595 HFS 125 95 127.902 125.998 19.113 15.638 46.968
106 125100 HFS 125 100 127.902 125.998 16.734 13.016 41.128
107 125105 HFS 125 105 127.902 125.998 14.203 11.047 35.608
108 13075 HFS 130 75 133.595 131.606 33.825 27.675 77.264
109 13080 HFS 130 80 133.595 131.606 30.800 25.200 72.253
110 13085 HFS 130 85 133.595 131.606 28.050 22.950 67.375
111 13090 HFS 130 90 133.595 131.606 25.300 20.700 62.188
112 13095 HFS 130 95 133.595 131.606 22.550 18.450 56.693
113 130100 HFS 130 100 133.595 131.606 19.800 16.200 50.889
114 130105 HFS 130 105 133.595 131.606 17.050 13.950 44.777
115 130110 HFS 130 110 133.595 141.531 14.906 11.594 39.013
116 14075 HFS 140 75 143.670 141.531 39.325 32.175 94.237
117 14080 HFS 140 80 143.670 141.531 36.575 29.925 89.697
118 14085 HFS 140 85 143.670 141.531 33.550 27.450 84.348
119 14090 HFS 140 90 143.670 141.531 30.800 25.200 79.161
120 14095 HFS 140 95 143.670 141.531 28.050 22.950 73.666
121 140100 HFS 140 100 143.670 141.531 25.300 20.700 67.862
122 140105 HFS 140 105 143.670 141.531 22.550 18.450 61.750
123 140110 HFS 140 110 143.670 141.531 19.800 16.200 55.330
124 140115 HFS 140 115 143.670 141.531 17.050 13.950 48.601
125 140120 HFS 140 120 143.670 141.531 14.906 11.594 42.282
126 15085 HFS 150 85 154.551 152.250 40.095 32.805 105.164
127 15090 HFS 150 90 154.551 152.250 37.070 30.330 99.516
128 15095 HFS 150 95 154.551 152.250 34.320 28.080 94.058
129 150100 HFS 150 100 154.551 152.250 31.570 25.830 88.291
130 150105 HFS 150 105 154.551 152.250 28.820 23.580 82.216
131 150110 HFS 150 110 154.551 152.250 26.070 21.330 75.833
132 150115 HFS 150 115 154.551 152.250 23.320 19.080 69.141
133 150120 HFS 150 120 154.551 152.250 20.570 16.830 62.141
134 150125 HFS 150 125 154.551 152.250 17.820 14.580 54.833
135 16085 HFS 160 85 164.854 162.399 45.722 37.409 125.164
136 16090 HFS 160 90 164.854 162.399 42.972 35.159 120.045
137 16095 HFS 160 95 164.854 162.399 40.222 32.909 114.618
138 160100 HFS 160 100 164.854 162.399 37.472 30.659 108.882
139 160105 HFS 160 105 164.841 162.387 34.713 28.401 102.808
140 160110 HFS 160 110 164.841 162.387 31.963 26.151 96.456
141 160115 HFS 160 115 164.841 162.387 29.213 23.901 89.795
142 160120 HFS 160 120 164.841 162.387 26.463 21.651 82.826
143 160125 HFS 160 125 164.841 162.387 23.713 19.401 75.548
144 160130 HFS 160 130 164.841 162.387 20.963 17.151 67.962
145 160135 HFS 160 135 164.841 162.387 18.213 14.901 60.068
146 17080 HFS 170 80 175.004 172.399 54.015 44.194 150.938
147 17085 HFS 170 85 175.004 172.399 51.265 41.944 146.128
148 17090 HFS 170 90 175.004 172.399 48.515 39.694 141.010
149 17095 HFS 170 95 175.004 172.399 45.765 37.444 135.583
150 170100 HFS 170 100 175.004 172.399 43.015 35.194 129.848
151 170105 HFS 170 105 175.004 172.399 40.265 32.944 123.804
152 170110 HFS 170 110 174.992 172.387 37.504 30.685 117.415
153 170115 HFS 170 115 174.992 172.387 34.754 28.435 110.754
154 170120 HFS 170 120 174.992 172.387 32.004 26.185 103.785
155 170125 HFS 170 125 174.992 172.387 29.254 23.935 96.507
156 170130 HFS 170 130 174.992 172.387 26.504 21.685 88.921
157 170135 HFS 170 135 174.992 172.387 23.754 19.435 81.027
158 170140 HFS 170 140 174.992 172.387 21.004 17.185 72.824
159 170145 HFS 170 145 174.992 172.387 18.254 14.935 64.313
160 18085 HFS 180 85 185.614 181.939 56.809 46.480 168.345
161 18090 HFS 180 90 185.614 181.939 54.059 44.230 163.227
162 18095 HFS 180 95 185.614 181.939 51.309 41.980 157.800
163 180100 HFS 180 100 185.614 181.939 48.559 39.730 152.065
164 180105 HFS 180 105 185.614 181.939 45.809 37.480 146.021
165 180110 HFS 180 110 185.614 181.939 43.059 35.230 139.670
166 180115 HFS 180 115 185.602 181.927 40.295 32.969 132.965
167 180120 HFS 180 120 185.602 181.927 37.545 30.719 125.996
168 180125 HFS 180 125 185.602 181.927 34.795 28.469 118.719
169 180130 HFS 180 130 185.602 181.927 32.774 25.491 111.132
170 180135 HFS 180 135 185.602 181.927 29.961 23.303 103.238
171 180140 HFS 180 140 185.602 181.927 27.149 21.116 95.035
172 180145 HFS 180 145 185.602 181.927 24.336 18.928 86.524
173 180150 HFS 180 150 185.602 181.927 21.524 16.741 77.705
174 180155 HFS 180 155 185.602 181.927 18.711 14.553 68.577
175 190100 HFS 190 100 195.790 191.913 54.102 44.265 175.534
176 190105 HFS 190 105 195.790 191.913 51.352 42.015 169.491
177 190110 HFS 190 110 195.790 191.913 48.602 39.765 163.139
178 190115 HFS 190 115 195.790 191.913 45.852 37.515 156.480
179 190120 HFS 190 120 195.790 191.913 43.102 35.265 149.511
180 190125 HFS 190 125 195.781 191.905 40.339 33.004 142.191
181 190130 HFS 190 130 195.781 191.905 37.589 30.754 134.605
182 190135 HFS 190 135 195.781 191.905 34.839 28.504 126.710
183 190140 HFS 190 140 195.781 191.905 32.818 25.525 118.508
184 190145 HFS 190 145 195.781 191.905 30.005 23.338 109.996
185 190150 HFS 190 150 195.781 191.905 27.193 21.150 101.177
186 190155 HFS 190 155 195.781 191.905 24.380 18.963 92.049
187 190160 HFS 190 160 195.781 191.905 21.568 16.775 82.613
188 190165 HFS 190 165 195.781 191.905 18.755 14.588 72.868
189 200100 HFS 200 100 206.576 202.486 60.528 49.523 202.950
190 200105 HFS 200 105 206.576 202.486 57.778 47.273 196.969
191 200110 HFS 200 110 206.576 202.486 55.028 45.023 190.679
192 200115 HFS 200 115 206.576 202.486 52.278 42.773 184.081
193 200120 HFS 200 120 206.576 202.486 49.528 40.530 177.175
194 200125 HFS 200 125 206.564 202.474 46.760 38.258 169.900
195 200130 HFS 200 130 206.564 202.474 44.010 36.008 162.376
196 200135 HFS 200 135 206.564 202.474 41.260 33.758 154.543
197 200140 HFS 200 140 206.564 202.474 38.510 31.508 146.402
198 200145 HFS 200 145 206.564 202.474 35.760 29.258 137.953
199 200150 HFS 200 150 206.564 202.474 33.010 27.008 129.195
200 200155 HFS 200 155 206.564 202.474 30.948 24.071 120.129
201 200160 HFS 200 160 206.564 202.474 28.136 21.883 110.754
202 200165 HFS 200 165 206.564 202.474 25.323 19.696 101.071
203 200170 HFS 200 170 206.564 202.474 22.511 17.508 91.080
204 200175 HFS 200 175 206.564 202.474 19.698 15.321 80.780
205 210125 HFS 210 125 216.752 212.460 52.321 42.808 196.010
206 210130 HFS 210 130 216.752 212.460 49.571 40.558 188.487
207 210135 HFS 210 135 216.752 212.460 46.821 38.308 180.656
208 210140 HFS 210 140 216.752 212.460 44.071 36.058 172.516
209 210145 HFS 210 145 216.752 212.460 41.308 33.798 164.027
210 210150 HFS 210 150 216.752 212.460 38.558 31.548 155.269
211 210155 HFS 210 155 216.752 212.460 35.808 29.298 146.203
212 210160 HFS 210 160 216.752 212.460 33.058 27.048 136.828
213 210165 HFS 210 165 216.752 212.460 30.997 24.109 127.145
214 210170 HFS 210 170 216.752 212.460 28.184 21.921 117.154
215 210175 HFS 210 175 216.752 212.460 25.372 19.734 106.854
216 210180 HFS 210 180 216.752 212.460 22.559 17.546 96.246
217 210185 HFS 210 185 216.752 212.460 19.747 15.359 85.330
218 220140 HFS 220 140 226.928 222.434 49.614 40.594 199.818
219 220145 HFS 220 145 226.928 222.434 46.864 38.344 191.371
220 220150 HFS 220 150 226.917 222.424 44.094 36.077 182.536
221 220155 HFS 220 155 226.917 222.424 41.344 33.827 173.470
222 220160 HFS 220 160 226.917 222.424 38.594 31.577 164.095
223 220170 HFS 220 170 226.917 222.424 33.094 27.077 144.421
224 220180 HFS 220 180 226.917 222.424 28.221 21.949 123.513
225 230155 HFS 230 155 237.104 232.408 46.908 38.379 202.105
226 230160 HFS 230 160 237.104 232.408 44.158 36.129 192.732
227 230170 HFS 230 170 237.109 232.414 38.644 31.618 173.016
228 230180 HFS 230 180 237.109 232.414 33.144 27.118 152.108
229 230190 HFS 230 190 237.109 232.414 28.272 21.990 129.967
230 250180 HFS 250 180 257.455 252.357 44.244 36.200 213.027
231 250190 HFS 250 190 257.446 252.348 38.718 31.679 190.774
232 250200 HFS 250 200 257.446 252.348 33.218 27.179 167.399
 
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