The product name specification material steel factory/origin price (yuan/ton) is Φ6.5mm higher than yesterday's last month than the previous month General line Φ6.5mm Q235 Handan Steel 5240 -60 -190 -380 Common line Φ8mm Q235 Handan Steel 5240 -60 -190 -360 Line Φ10mm Q235 Handan Steel 5240 -60 -190 -360 High Line Φ6.5mm Q235 Guangzhou Steel 5400 0 -130 -400 High Line Φ6.5mm Q235 Handan Steel 5340 -60 -230 -490 High Line Φ6.5mm Q335 North Taiwan 5340 - 60 -210 -460 High Line Φ6.5mm Q335 Pinggang 5300 -60 -170 -460 Rebar Φ12mm HRB335 Ma Steel 5400 -20 -90 -300 Rebar Φ12mm HRB335 Tang Steel 5400 -20 -90 -300 Rebar Φ18- 25mm HRB335 Ma Steel 5200 0 -120 -200 Rebar Φ16-25mm HRB335 Tang Steel 5200 0 -120 -200 Rebar Φ18-25mm HRB335 Liu Steel 5200 0 -120 -200 Rebar Φ18-25mm HRB335 Ping Steel 5230 0 -120 -270 Rebar Φ18-25mm HRB335 建龙5200 0 0 -130 Rebar Φ18-25mm HRB335 Shougang 5100 0 -100 -230 Rebar Φ16-25mm HRB335 新抚5080 0 -80 -250 Rebar Φ16-25mm HRB335 广钢5280 0 -100 -260 Rebar Φ12mm HRB335 Handan Steel 5460 0 -80 -210 Rebar Φ14mm HRB335 Handan Steel 5440 0 -90 -200 Rebar Φ16mm HRB335 Handan Steel 5290 0 -90 -210 Steel Φ18-25mm HRB335 Handan Steel 5280 0 -90 -190 Rebar Φ16-25mm HRB335 Yufeng 5290 0 90 -30 Rebar Φ16-25mm HRB335 Cold Steel 5260 0 -70 -190 Rebar Φ16-25mm HRB335 Wanxin 5150 0 -50 -220 Grade III Rebar Φ12mm HRB400 Magang 5450 0 -100 -320 Grade III Rebar Φ14mm HRB400 Ma Steel 5360 0 -190 -410 Grade III Rebar Φ16-25mm HRB400 Ma Steel 5270 0 -150 -380 III Grade Rebar Φ16-25mm HRB400 Grade 5530 0 -90 -270 Grade III Rebar Φ16-25mm HRB400 Grade 5550 0 -80 -250 Class III Rebar Φ18-25mm HRB400 Grade 5300 0 -100 -400 Class III Thread Steel Φ18-Φ25mm HRB400 Pinggang 5300 0 -100 -500 Hot rolled coil 2.75mm*1250*C Q235 Steel 6050 -100 -150 -200 Hot rolled coil 2.75mm*1250*C Q235 Pearl steel 6100 -50 -100 - 250 Hot rolled coil 2.75mm*1250*C Q235 Handan Steel 6100 -50 -100 -250 Hot rolled coil 2.75mm*1250*C Q235 Tangshan Steel 6050 -50 -150 -250 Hot rolled coil 3.0mm*1250*C Q235 Angang Hot Rolled Steel Sheets 6070 -30 -80 -130 Hot rolled coils 3.0mm*1500*C Q235 Tangsteel 6070 -30 -80 -130 Hot rolled coils 4.75mm*1500*C Q235 Tangshan Steel 5330 -50 -200 -620 Hot Rolling Roll 4.75mm*1500*C Q235 Ben Steel 5330 -50 -200 -620 Hot Roll 5.5mm*1500*C Q235 Tang 5330 -50 -200 -620 Hot rolled coil 5.75mm*1500*C Q235 Liugang 5330 -50 -420 -620 Hot rolled coil 5.75mm*1500*C Q235 Angang/Bengang 5330 -50 -200 -620 Hot rolled coil 5.75mm*1800*C Q235 Masteel 5330 -50 -200 -820 Hot rolled coil 7.5mm*1500*C Q235 Ben Steel 5330 -50 -200 -620 Hot rolled coil 7.5mm *1500*C Q235 Tangshan Steel 5330 -50 -200 -620 Hot rolled coil 11.5*1500*C Q235 Tangshan Steel 5330 -50 -200 -620 Steel 183-232mm*2.5 DF01 Steel 5160 0 -230 -460 Steel 295-355mm*2.5 DF01 Ruifeng 5180 -20 -250 -580 Strip 295-352mm*2.5 Q195L Tangshan Jianlong 5090 -110 -340 -670 Strip 275mm*2.5 Q195L Shan Steel 5140 -40 -320 -590 Strip 240-255mm*2.5 Q195 Tong Steel 5120 -30 -310 -600 Steel Band 255mm*2.5 Q235 Tianjin Roll 1 5560 -40 -90 -140 Strip 352mm*2.75 Q235 Tang Steel 5180 -20 -250 -580 Strip 434mm* 3.0 Q235 Tangshan Steel 5180 -20 -250 -590 Strip 680-720mm*5.0 HG5 Beitai 5550 0 -100 -320 Strip 438-520mm*2.75 HG5 Xingye 5480 -40 -160 -330 Strip 680-735mm*5.0 HG5 Song Ting 5520 0 -150 -330 Strip 505-700mm*2.75 HG5 Vertical and horizontal 5520 -30 -310 -520 Cold rolled coil 1.0mm*1250*2500 SPCC Angang 66 00 -150 -200 -530 Cold rolled coil 1.2mm*1250*2500 ST12 Angang 6600 -150 -200 -530 Cold rolled coil 2.0mm*1250*2500 ST12/DC01 Angang 6600 -150 -200 -530 cold rolled plate Roll 3.0mm*1250*2500 ST12/DC01 Angang 7700 0 -50 -200 Cold rolled coil 1.0mm*1500*C SPCC Steel 6580 -120 -170 -500 Cold rolled coil 1.0*1250*2500 SPCC Wuhan Steel 6580 - 120 -170 -500 Cold rolled coil 1.5mm*1250*2500 ST12 Wugang 6580 -120 -170 -500 Cold rolled coil 2.0mm*1250*2500 ST12 Wuhan Iron and Steel 6580 -120 -170 -500 Cold rolled coil 3.0mm* 1250*2500 ST12 Wuhan Iron and Steel 6580 -1120 -1170 -1270 Cold rolled coil 1.0mm*1250*c ST12 Kunming Steel 6350 -200 -300 -680 Cold rolled coil 1.0mm*1250*c ST12 Ma Steel 6400 -150 -250 -630 Cold rolled coils 1.0mm*1250*c ST12 Handan Steel 6400 -150 -250 -630 Puzhong 6mm Q235B Xinyu 6700 -60 -230 -400 Puzhong 8mm Q235A Handan Steel 6650 -60 -230 -400 Pu Medium plate 10mm Q235A Handan steel 6350 -60 -230 -400 Medium plate 14-20mm Q235A Handan steel 6200 -60 -230 -400 Puzhong plate 22-28mm Q235B Handan steel 6200 -60 -230 -400 Medium plate 10mm Q235A Liu Gang 6300 -50 -200 -450 Puzhong Plate 12mm Q235A Liuzhou Steel 6200 0 -200 -450 Puzhong Board 14-20mm Q235 A Liugang 6150 -50 -200 -450 Puzhong plate 8mm Q235A Xinyu 6650 -60 -230 -400 Puzhong plate 10mm Q235A Xinyu 6270 -60 -230 -400 Puzhong plate 12mm Q235A Xinyu 6250 -60 -230 -400 Pu Medium plate 14-20mm Q235A Xinyu 6200 -60 -230 -400 Low alloy plate 8mm Q345 Handan steel 6770 -70 -230 -400 Low alloy plate 10mm Q345 Handan steel 6430 -60 -230 -400 Low alloy plate 12mm Q345 Handan steel 6450 -60 -230 -400 Low Alloy Plate 20mm Q345 Hand Steel 6390 -60 -230 -400 Seamless Pipe Φ25*2.5 20# Wuxi 8400 -500 -500 -700 Seamless Pipe Φ38*3 20# Xinyu 7650 -200 -200 -650 seamless pipe Φ48*4 20# Xinyu 7650 -200 -200 -650 seamless pipe Φ57*3.5 20# Xinyu 7650 -200 -200 -650 seamless pipe Φ60*4 20# Xinyu 7650 -200 -200 -650 Seamless pipe Φ89*4.5 20# Guangxi 7650 -200 -200 -550 Seamless pipe Φ108*4.5 20# Angang 7650 -200 -200 -550 Seamless pipe Φ219*7 20# Chenggang 8000 -150 -150 -450 None Seam Φ219*7 20# Steel 8400 0 0 -250 I-beam 18#/a Q235 Sea Steel 5550 0 0 -50 I-beam 25#/a Q235 Laigang 5700 0 0 -50 I-beam 25#/ b Q235 Wugang 5700 0 0 -50 I-beam 25#/b Q235 Laiwu Steel 5720 0 0 -50 I-beam 36#/b Q235 Laiwu Steel 605 0 0 0 -50 I-beam 40#/b Q235 Laiwu Steel 6080 0 0 -50 Channel 16#a Q235 Masteel 5650 0 0 -100 Channel 16#a Q235 Masteel 5650 0 0 -420 Channel 20# Q235 Ma Steel 5760 0 0 0 Channel 16#a Q235 Ma Steel 5760 0 0 Channel 20# Q235 Ma Steel 5750 0 0 0 Angle Steel 40*5mm Q235 Steel 55760 0 0 Angle Steel 50*50*5mm Q235 Ma Steel 5650 0 0 -50 Angle steel 50*50*5mm Q235 Tong steel 5630 0 0 -50 Angle steel 140*140*5mm Q235 Ma steel 5710 0 0 0 Galvanized coil 0.7mm*1000*C ST02Z Angang 7550 0 0 -70 Galvanized Volume 1.0mm*1000*C ST02Z Angang 7380 0 0 -70 Galvanized coil 0.7mm*1000*C ST02Z Bengang 7480 0 0 -100 Galvanized coil 1.0mm*1000*C ST02Z Bengang 7300 0 0 -100 Galvanized Roll 1.0mm*1000*C DC51D+Z Bengang 7300 0 0 -100 Galvanized Roll 1.0mm*1000*C DC51D+Z Ma Steel 7300 0 0 -200 Color Coil 0.326mm*1200*C SGCC Taiwan Min Hui 8950 0 0 -150 Color Coil 0.376mm*1000*C SGCC Taiwan Cocoon 8950 0 0 -150 Color Coil 0.5mm*1000*C SGCC Baosteel 8800 0 0 -200 Color Coil 0.426mm*1000*C CGCC Shunpu 8650 0 0 -130 Color Coil 0.476mm*1000*C CGCC Shunpu 8550 0 0 -130
Percussion drilling is employed when auger or wash boring is not possible in very stiff soil or rock. It also can be used in most soil types.
Here the advancement of a hole is achieved by alternatively lifting and dropping a heavy cutting or hammering bit that is attached to a rope or cable that is lowered into an open hole or inside a temporary casing (casings are hollow cylindrical pipes used for borehole stability and to prevent the loss of drilling fluid through the boreholes).
Usually a tripod is used to support the cable. The stroke of bit varies according to the ground condition. The major disadvantage of this method is that it is not possible to get good-quality undisturbed samples. In very hard rock (and especially fractured hard rock), down-the-hole (DTH) drilling can be employed. In this case the hammer, applying repeated percussive pressure, is located just behind the drill bit inside the hole, unlike the open percussion drilling, where the hammer is on top of the drilling string.
The drilling string provides the necessary force and rotation to the hammer and bit, as well as compressed air or fluids to the hammer and for the flushing of cuttings.
This arrangement also allows for much deeper percussion drilling. However, the DTH drills are typically more expensive.
Percussion Drilling Rig,Cable Percussion Drilling,Percussion Drilling Equipment,Deep Foundation Engineering Percussion Rig
Henan YK Prospecting Machinery Co., Ltd , https://www.yikyuirig.com