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The hardness of 20 steel without heat treatment is hb156, while the lowest hrc18 corresponds to hb212

20 steel is low carbon steel with 0.2% carbon content. Steel can be divided into low carbon steel, medium carbon steel and high carbon steel

carbon content: low carbon steel is generally less than 0.25%; Medium carbon steel generally ranges from 0.25% to 0.60%; High carbon steel is generally more than 0.60%

except for carbon (c) and a certain amount of silicon (SI) (generally not more than 0.40%) and manganese (MN) (generally not more than 0.80%, up to 1.20%) for deoxidation, the steel does not contain other alloying elements (except for resial elements)

distinguish between steel and iron: steel with carbon content lower than 2.11%, iron with carbon content higher than 2.11%; The higher the carbon content in steel, the worse the toughness. The lower the carbon content in iron, the better the toughness

extended data:

related properties

characteristics

(1) characteristics this steel belongs to high-quality low-carbon steel, cold extrusion, carburizing and hardening steel. The steel has low strength, good toughness, plasticity and weldability. The tensile strength is 253-500mpa and the elongation is ≥ 24%

20 steel are similar to that of 15 steel, but the strength is slightly higher. Application: it is suitable for manufacturing small and medium sized carburizing and nitrocarburizing parts in automobile, tractor and general machinery manufacturing instry, such as hand brake shoe, lever shaft, transmission fork, driving passive gear on automobile, camshaft on tractor, suspension equalizer shaft, equalizer inner and outer bushing, etc

the technological process of die parts of this steel is as follows: blanking → forging die blank → annealing → mechanical rough machining → cold extrusion forming → recrystallization annealing → mechanical finish machining → carburizing → quenching and tempering → grinding and polishing → assembly

(2) the hardness is not heat treated, and the hardness is less than or equal to 156hbs

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The applicant's ID card, household register and three two inch recent bareheaded white background color photos are required to apply for the disability card

1. Application:

the applicant who applies for the disabled persons' card for the first time shall apply to the County disabled persons' Federation of the place where the registered permanent residence is located by holding the applicant's ID card, household register and three two inch recent bareheaded white background color photos, and truthfully fill in the application form Evaluation form. The proof materials of legal guardian shall be provided at the same time when applying for intellectual and mental disability certificate and minors applying for disability certificate. Where conditions permit, online application can be carried out

2. Acceptance:

after the County disabled persons' Federation receives the application materials submitted by the applicant, the acceptor will confirm the applicant, legal guardian, photo, ID card and household register, and will not accept those who fill in false information

extended data

according to the relevant provisions of Article 23 of the measures of the people's Republic of China for the administration of disabled persons' certificates:

for the transfer of disabled persons' registered permanent residence, the transfer proceres of disabled persons' certificates must be handled at the same time. The certificate holder shall present the certificate of household registration migration issued by the public security organ to the county-level disabled persons' Federation of the place where the registered permanent residence is moved out to issue the certificate of migration of disabled person. The county-level disabled persons' Federation of the place where the registered permanent residence is moved out shall mark the corresponding information in the basic database of the disabled population as the status of moving out in time

people with disabilities should register with the county-level disabled persons' Federation of the places where they move out of their registered permanent residence on the basis of the application form, assessment form and other archival materials of the disabled persons' card transferred out by the county-level disabled persons' Federation of the places where they move out of their registered permanent residence and the certificate of the disabled persons' card transfer issued by the disabled persons' Federation

according to the migration certificate, the county-level disabled persons' Federation of the place where the registered permanent residence is moved indicates the date of migration of the disabled person's certificate in the remarks column of the disabled person's certificate and affix the official seal, and completes the migration work in the basic database of the disabled population

if the disabled persons' Federation of the immigrating place disagrees with the original disability assessment, it may request that the disability assessment be concted again in the immigrating place

for those who have not gone through the transfer proceres of the disabled person's certificate for more than half a year after the migration, the original disabled persons' Federation can mark it as frozen status in the disabled population database, and change it to move out status after going through the transfer proceres

I have 7 2-inch bareheaded white background certificates (different standards in different places, some more, it is recommended to take 8)

second generation identity card, registered residence book original and 3 copies, each of which is not in conformity with the contents of the household register, and must be accompanied by the certificate issued by the public security organ at the place where the residence is registered. p>

truthfully fill in the application form of the people's Republic of China for disability certificate and the disability assessment form of the people's Republic of China in triplicate