Hardness range of steel pipe used in thermal power plants
Hardness range of steel (steel pipe) used in thermal power plants
The steel used in thermal power plants is mainly used in the four major pipelines of thermal power plants.
The four major pipelines of a thermal power plant include: a main steam pipeline, a high temperature reheat steam pipeline, a low temperature reheat steam pipeline, and a high pressure water supply pipeline.
Therefore, the steel (steel pipe) commonly used in thermal power plants must meet the requirements for the use of the four major pipelines.
Commonly used steel (steel pipe) material for thermal power plants:
SA210 C, SA234-WPC, SA234-WPB, 20MnMo, 15MnMoV, SA209 T1, SA182 F1, SA234-WP111, SA234-WP121, A691-11 / 4Cr, SA213-T2, SA182-F2, SA182-F12, A213 T11, A213 T12, A213 T23, SA182-F22, 1Cr5Mo, A213 T91, A213 T92,1Crl3, OCrl3A1,1Crl8Ni9,0Cr23Ni13, 0Cr23Ni13, l0, 20, 12Cr2Mo, 10CrMoV, 15CrMo, 15CrMo, ZGZOCrMoV, ZG15Cr1Mo1V, 12Cr1MoV, Cr2Mo1, SA213 T9 , 10CrMo9lO and so on.
Hardness power plant common steel hardness range chart
Hardness power plant common steel hardness range chart
| Steel | Grade | Hardnes | Standard | ||||
| Steel pipe used in thermal power plants | 1 | SA210C | HB≤179 | ASTM A210 | |||
| 2 | SA234-WPC | HB≤197 | ASTM A234 | ||||
| 3 | SA234-WPB | HB≤197 | ASTM A234 | ||||
| 4 | 20MnMo | HB149～217 | JB755 | ||||
| 5 | 15MnMoV | HB156～228 | JB755 | ||||
| 6 | SA209T1 | HB≤146 | ASTM A209 | ||||
| 7 | SA182F1 | HB143～192 | ASTM A182 | ||||
| 8 | SA234-WP111 | HB≤197 | ASTM A234 | ||||
| 9 | SA234-WP121 | HB≤197 | ASTM A234 | ||||
| l0 | T1 | HB≤146 | ASTM A209 | ||||
| 11 | A691-11/4Cr | HB≤201 | ASTM A691 | ||||
| l2 | SA213-T2 | HB≤217 | ASTM A213 | ||||
| l3 | SA182-F2 | HB143～192 | ASTM A182 | ||||
| l4 | SA182-F12 | HB 121～174 | ASTM A182 | ||||
| l5 | T11 | HB≤163 | ASTM A213 | ||||
| l6 | T12 | HB≤163 | ASTM A213 | ||||
| l7 | T23 | HB≤220 | ASTM A213 | ||||
| l8 | SA182-F22 | HB≤170 | ASTM A182 | ||||
| l9 | 1Cr5Mo | HB 156～241 | JB755 | ||||
| 2O | T9l | HB≤250 | ASTM A213 | ||||
| 2l | T92 | HB≤250 | ASTM A213 | ||||
| 22 | 1Crl3 | HB≤159 | GB 1220 | ||||
| 23 | OCrl3A1 | HB≤183 | GB 1220 | ||||
| 24 | 1Crl8Ni9 | HB≤187 | GB 1220 | ||||
| 25 | 0Cr23Ni13 | HB≤187 | GB 1220 | ||||
| 26 | 1Cr18Ni9Ti | HB≤187 | GB 1220 | ||||
| 27 | l0 | HB≤137 | GB3087 | ||||
| 28 | 20 | HB≤156 | GB3087 | ||||
| 29 | 12Cr2Mo | HB≤170 | GB5310 | ||||
| 30 | 10CrMoV | HB≤166 | GB5310 | ||||
| 3l | 15CrMo | HB≤179 | GB5310 | ||||
| 32 | ZG20CrMo | HB 135～140 | DJ156 | ||||
| 33 | ZGZOCrMoV | HB135～140 | JB264O | ||||
| 34 | ZG15Cr1Mo1V | HB2OO～255 | JB264O | ||||
|
Straight,
Bent pipe,
Steam guide
|
1 | 12Cr1MoV | HB≤170 | ||||
| 2 | Cr2Mo1 | HB≤170 | |||||
| 3 | SA213:T9 | HB≤179 | |||||
| 4 | SA213: other | HB≤163 | |||||
| Alloy steel header | 1 | 12Cr1MoV | HB≤170 | ||||
| 2 | 10CrMo9lO | HB≤170 | |||||
| Weld |
The weld of the same kind of steel welded joints is generally not more than 100 times of the base material HB after heat treatment;
For non-austenitic welds of welded joints in heterogeneous port, the hardness after heat treatment generally does not exceed the height of high alloy steel base material HB plus 100; both must meet the following requirements:
|
||||||
| l | Total alloy content <3% | HB≤270 |
The same kind of steel:
DL/T 869-2012
Dissimilar steel:
DL/T 752-2010
|
||||
| 2 | Total alloy content 3%～10% | HB≤300 | |||||
| 3 | Total alloy content >10% | HB≤350 | |||||
| Note: Dissimilar steel calculates the total alloy content from the composition of the base material with low alloy content. | |||||||
| Turbine rotor | l | 25Cr2Ni4MoV |
HB230～260 (236～286) |
||||
| 2 | 34CrNi3Mo | HB240～270 | |||||
| 3 | 30Cr2MoV(P2) |
HB255～321 (241～277) |
|||||
| 4 | 30Cr1Mo1V | HB250～280 | JB/T 1265 | ||||
| High temperature bolt | l | 35 | HB146～187 | DL439-91 | |||
| 2 | 45 | HB187～227 | |||||
| 3 | 20CrMo | HB197～241 | |||||
| 4 | 35CrMo | HB217～255 | |||||
| 5 | 20Cr1MolV1 | HB248～277 | |||||
| 6 | 20Cr1MolVTiB | HB255～293 | |||||
| 7 | 25Cr2Mo1V | HB241～277 | |||||
| HB240～290 | DL438-2009 | ||||||
| 8 | 25Cr2MoV | HB241～277 | DL439-91 | ||||
| HB240～290 | |||||||
| 9 | C422(20Cr12NiMoWV) | HB277～331 | |||||
| l0 | R26(Ni-Cr-Co alloy) | HB262～331 | |||||
| 11 | 20Cr1Mo1VNbTiB | HB241～285 | DL439-91 | ||||
| HB240～290 | DL438-2009 | ||||||
| l2 | W4OCrMoV | HB255～321 | |||||
| 13 | 42CrMo | HB248～311 | |||||
| l4 | K11C81E-R0(High alloy steel) | HB291～321 | DL438-2009 | ||||
| 15 | GH4145/SQ(alloy) | HB262～331 | |||||
| Steam turbine bolt | 1 | 30CrMoA | Rm（σb）≥686Mpa | HB217～255 | Steam turbine | ||
| Rm（σb）≥784Mpa | HB241～277 | ||||||
| Rm（σb）≥862Mpa | HB277～302 | ||||||
| 2 | 30Cr2MoV | Rm（σb）≥735Mpa | HB241～277 | ||||
| Rm（σb）≥833Mpa | HB269～302 | ||||||
| Note: The nut material is generally one level lower than the bolt material, and the hardness is 20~50HB. | |||||||
Detailed explanation:
T91 190～250
T22 130～179
Standard GB3077-88
The hardness of 12Cr1MoV steel is not more than 179 in the annealing or high temperature tempering supply state.
The hardness range of 25Cr2Mo1V as steel for bolts is: HB241--277
35 steel The hardness range of steel used as bolts is: HB146--187
20Cr1Mo1VTiB as a bolt steel hardness range: HB255--293
Standard GB699-88
20 steel delivery state hardness HB is not greater than 156
30 steel delivery state hardness HB is not more than 170
35 steel delivery state hardness HB is not greater than 179
Common bolt material hardness standards
| Grade | Hardness | Note |
| K11C81E-Ro | HB291～HB321 | High alloy steel |
| GH4145/SQ | HB262～HB331 | Alloy steel |
| C-422（20Cr12NiMoWV） | HB277～HB331 | High alloy steel |
| R26（Ni-Cr-Co) | HB262～HB331 | Alloy steel |
New bolts of 20Cr1Mo1VNbTiB steel after quenching and tempering, hardness is HB240～HB290;
After the operation of the 25Cr2Mo1V and 25Cr2MoV steel bolts, the test results should be in accordance with the hardness of HB240 ~ HB290;
Standard SA234 (forged carbon steel and alloy steel pipe fittings for medium and high temperature)
For WP5, WP9 and WPR grade steel pipe fittings - up to 217HB.
For WP91 grade steel pipe fittings - up to 248HB.
For other grades of steel fittings - up to 197HB.
Standard SA213 (seamless ferrite and austenitic alloy tubes for boilers, superheaters and heat exchangers T)
The hardness of T5b, T7 and T9 grade steel shall not exceed 179HB/190HV (89HRB), the hardness of T91 and T92 grade steel shall not exceed 250HB/265HV (25HRC), and the hardness of 18Cr-20Mo grade steel shall not exceed 217HB/230HV ( 96HRB),
All other ferrite grade hardnesses should not exceed 163HB/170HV (85HRB).
The hardness of TP201 and TP202 grade steel should not exceed 219HB/230HV (95HRB).
Tubes made from S30815, S31272, S31050 and S25700 have a Brinell hardness of no more than 217 HB (95 HRB).
The Brinell hardness of pipes made of TP310HCbN grade steel shall not exceed 256 HB (100 HRB).
The hardness of XM-19 (UNS S20910) grade steel should not exceed 250HB/265HV (25HRC).
The hardness of all other austenitic grade steels shall not exceed 192HB/200HV (90HRB).
Standard SA210 (seamless medium carbon steel tube for boiler and overheating T)
The hardness of the A-1 grade pipe shall not exceed the Rockwell hardness of 79 HRB or the Brinell hardness of 143 HB.
The hardness of the Class C pipe shall not exceed 89 Rockwell hardness or 179 HBB hardness.
Other:
10CrMo910 corresponds to China's grade 10Cr2Mo1. The US grade is SA213T22 (ASTM). According to DIN EN 10028-1/2, 10CrMo910 and P22 have a hardness range of 130-175HB.
Soviet grades 22K and 20K correspond to Chinese grades 22g and 20g; US grades are SA414E and SA414D
Weld hardness standard:
The weld hardness of the same kind of steel welded joint after heat treatment generally does not exceed the Brinell hardness of the base metal plus 100HBW, and does not exceed the following provisions:
When the total content of the alloy is <3%, the Brinell hardness value is ≤270HBW
When the total content of the alloy is 3%-10%, the Brinell hardness value is ≤300HBW
When the total content of the alloy is >10%, the Brinell hardness value is ≤350HBW
Weld hardness test of dissimilar steel welded joints shall comply with the provisions of DL/T752.
The hardness of the heat-resistant alloy steel weld is not lower than the hardness of the base metal.
Weld metallographic organization standards:
1, no cracks;
2. There is no burnt tissue;
3. There is no hardened martensite structure.
Specification for welding process qualification of boiler and pressure vessel in thermal power plants (SD340-89)
The hardness of the weld and heat affected zone generally does not exceed the Brinell hardness of the parent metal plus 100
Steel with chromium content <2%, HB≤250
Steel with chromium content ≥2%, HB≤300
Metal fusion welding weld defect classification and description GB6417-86
Metal fusion weld weld defects are classified into six categories: cracks, holes, solid inclusions, unfused and incomplete, and shape defects.
Unfused is divided into: the side wall is not fused, the layers are not fused, and the root of the weld is not fused.