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Bolt and stud's material request

First, bolt, bolt and stud's material request (GB/T3098.1-2000)

Performance rating	Material and heat treatment	Chemical composition, %					Drawing temperature ℃ min
		C		P max	S max	B1) max
		min	max
3.62)	Carbon steel	- -	0.20	0.05	0.06	0.003	- -
4.62)		- -	0.55	0.05	0.06	0.003	- -
4.82)
5.6		0.13	0.55	0.05	0.06	0.003	- -
5.82)		- -	0.55	0.05	0.06
6.82)
8.83)	Low-carbon alloyed steel (for example boron, manganese either chromium), quenching and tempering or medium carbon steel, quenching and tempering	0.154)	0.04	0.035	0.035	0.003	425
		0.25	0.55	0.035	0.035
9.8	Low-carbon alloyed steel (for example boron, manganese either chromium), quenching and tempering or medium carbon steel, quenching and tempering	0.154)	0.35	0.035	0.035	0.003	425
		0.25	0.55	0.035	0.035
10.95), 6)	Low-carbon alloyed steel (for example boron, manganese or chromium), quenching and tempering	0.154)	0.35	0.035	0.035	0.003	340
10.96)	Medium carbon steel, quenching and tempering either low, carbon alloy steel (for example boron, manganese or chromium), quenching and tempering or alloy steel quenching and tempering 7)	0.25 0.204)	0.55 0.55	0.035 0.035	0.035 0.035	0.03	425
		0.20	0.55	0.035	0.035	0.003
10.96), 8), 9)	Alloy steel, quenching and tempering 7)	0.28	0.50	0.035	0.035	0.003	380

1) the boron content may reach 0.005%, its non-effective boron may by the increase titanium and (or) the aluminum control.
2) these performance rating permission uses easily to cut the manufacture, its sulfur, the phosphorus and the lead biggest content is: Sulfur 0.34%; Phosphorus 0.11%; Lead 0.35%.
3) to guarantee that the good hardenability, the diameter of screw surpasses 20mm the fastener, must use to 10.9 level of stipulation steel.
4) the carbon amount is lower than 0.25% (ladle analysis) low-carbon alloyed steel's manganese lowest content is: 8.8 levels: 0.6%; 9.8th, 10.9 and 10.9 levels: 0.7%.
5) this product should increase a horizontal line symbol under the performance rating code number. 10.9 levels should tally to 10.9 level of stipulation all performance, but low along fire temperature to it, in raises ridicules the temperature under the condition, will cause the varying degree the stress to weaken.
6) uses in this performance rating the material being supposed to have the good hardenability, guaranteed fastener thread section core section before quenching, the tempering obtains the approximately 90% martensite organization.
below 7) the alloy steel should include in the far element one kind of element at least, its smallest content is: Chromium 0.30%; Nickel 0.30%; Molybdenum 0.20%; Vanadium 0.10%
8) considers the withstanding tensile stress, 12.9 levels of surfaces do not allow to have the white phosphorus accumulation level which the metallography can determine.
9) this chemical composition and in drawing temperature still at investigation and study.

Second, nut

1. nut (fine tooth thread) material specification (GB/T3098.2-2000)

Performance rating		Chemical composition, %
Performance rating		C max	Mn min	P max	S max
41), 51), 61)	- -	0.50	- -	0.060	0.150
8th, 9	041)	0.58	0.25	0.060	0.150
102)	051)	0.58	0.30	0.048	0.058
122)	- -	0.58	0.45	0.048	0.058
1) this performance rating may use Yi Qiegang to make (supply and demand both sides to have agreement exception in addition), its sulfur, the phosphorus and the lead biggest content is: Sulfur 0.30%; Phosphorus 0.11%; Lead 0.35%. 2) for improves nut's mechanical property, when the necessity may increase the alloying element.

The performance rating is 05, 8 (the >M16 l nut), 10 and 12 levels of nuts should carry on quenching and the drawing temper.

2. nut (fine thread) material specification (GB/T3098.4-2000)

Performance rating		Chemical composition: %
Performance rating		C max	Mn min	P max	S max
51), 6	- -	0.50	- -	0.060	0.150
82)	041)	0.58	0.25	0.060	0.150
102)	052)	0.58	0.30	0.048	0.058
122)	- -	0.58	0.45	0.048	0.058
1) this performance rating may use Yi Qiegang to make (supply and demand both sides to have agreement exception in addition), its sulfur, the phosphorus and the lead biggest content is: Sulfur 0.34%; Phosphorus 0.11%; Lead 0.35%. 2) for improves nut's mechanical property, when the necessity may increase the alloying element.

The performance rating is 05, 8 (the l nut), 10 and 12 levels of nuts should carry on quenching and the drawing temper.

3. riveting nut's material (GB/T17880.6-1999)

Product	Material	Standard number
The steel flat head, sinks, slightly to sink, 1200 slightly to sink and the flat head hexagonal riveting nut	08F	GB/T699
	ML10	GB/T6478
The aluminum alloy flat head and sinks the riveting nut	5056 (original LF5-1)	GB/T3190
The aluminum alloy flat head and sinks the riveting nut	6061 (original LD30)	GB/T3190

4. effective moment of force section hexagon stopping nut's material specification (GB3098.9-93)

The manufacture nut body's material should with the nut (coarse thread) the material is the same.
The manufacture metal or inlays a material to determine nonmetallic by the manufacturer.

Third, clamping screw nail's material specification (GB/T3098.3-2000)

Performance rating	Material	Heat treatment	Chemical composition, %
			C		P max	S max
			min	max	P max	S max
14H	Carbon steel 1), 2)	- -	0.50	- -	0.11	0.15
22H	Carbon steel 3)	Quenching and tempering	0.50	- -	0.05	0.05
33H	Carbon steel 3)	Quenching and tempering	0.50	- -	0.05	0.05
45H	Alloy steel 3), 4)	Quenching and tempering	0.50	0.19	0.05	0.05
when 1) uses Yi Qiegang, its lead, the phosphorus and the sulfur biggest content is: Lead 0.35%; Phosphorus 0.11%; Sulfur 0.34% 2) square head clamping screw nail permission surface hardening. 3) may use contains the lead quantity is 0.35% steel products most greatly. 4) should include one kind of either many kinds of chromium, the nickel, the molybdenum, the vanadium or the boronalloys element.

Note: The performance rating 45H clamping screw nail when can satisfy in the GB/T3098.3-2000 standard the 6.3rd stipulation guarantee torque request, may also use other material manufacture.

Fourth, uses the screw joint heat-resisting vice-(3098.8-92)
Is suitable in both can along with the high temperature, the alternating load, and must maintain in the quite great degree the pretightening up force and bears the fastener material which the fatigue strength under the operating mode condition uses to request.
1. uses in is bigger than +300℃ material, sees the table.

Continually work limiting temperature (reference) ℃	Bolt, stud		Nut
Continually work limiting temperature (reference) ℃	Material trademark	Standard trademark	Material trademark	Standard trademark
400	35A 45	GB699	35	GB699
500	30CrMo 35CrMo 35CrMoA	GB3077	35th, 45	GB699
500	30CrMo 35CrMo 35CrMoA	GB3077	20CrMoA	GB3077
510	21CrMoV		20CrMoA 35CrMoA	GB3077
550	20CrMoV 21CrMoV		30CrMo 35CrMo	GB3077
570	20CrMoVTiB 20CrMoVnBTiB		20CrMoV 21CrMoV
600	2Cr12WMoVNbB	(YB/Z8)	20CrMoV
650	GH2132	GBn177	21CrMoV

1) the bolt, the stud should compared to tired mother's degree of hardness high (for example high 30-50HB).
2) the stress drive pipe's material, the recommendation uses with the stud same material.
2. the material material should pass through the low time of organization's inspection. And, is generally loose, the center to be loose and the square shape segregation do not surpass the GB1979 stipulation second-level.

Fifth, stainless steel fastener's material specification
Bolt, bolt and stud (3098.3-2000), nut (3098.15-2000), clamping screw nail (3098.16-2000)
Gives according to the related national standards production's fastener suitable stainless steel material in table 1.
Only if supply and demand both sides have the agreement in addition, the chemical composition should, in the steel group stipulated in the scope, chooses by the manufacturer.
In has the situation which the intercrystalline corrosion favors, recommends carries on the experiment according to ISO3651-1 or the ISO3651-2 stipulation. Under this situation, the recommendation uses the stability mode A3 and A5, or uses the carbon amount not to surpass 0.03% A2 and a4 stainless steel.

Table 1 stainless steel category and chemical composition

Category	Rank	Chemical composition 1), %									Note
Category	Rank	C	Su	Mn	P	S	Cr	Mo	Ni	Cu	Note
Austenite	A1	0.12	1	6.5	0.2	0.15-0.35	16-19	0.7	5-10	1.75-2.25	2), 3), 4)
	A2	0.1	1	2	0.05	0.053	15-20	- 5)	8-19	4	7), 8)
	A3	0.08	1	2	0.045	0.03	17-19	- 5)	9-12	1	9)
	A4	0.08	1	2	0.045	0.03	16-18.5	2-3	10-15	1	8), 10)
	A5	0.08	1	2	0.045	0.03	16-18.5	2-3	10.5-14	1	9), 10)
Martensite	C1	0.09-0.15	1	1	0.05	0.03	11.5-14	-	1	-	10)
	C3	0.17-0.25	1	1	0.04	0.03	16-18	-	1.5-2.5	-
	C4	0.08-0.15	1	1.5	0.06	0.15-0.35	12-14	0.6	1	-	2), 10)
Ferrite	F1	0.12	1	1	0.04	0.03	15-18	- 6)	1	-	11), 12)

1) besides already indication, was a maximum value.
2) the sulfur available selenium replaces.
3) like the nickel content is lower than 8%, then the manganese smallest content must be 5%.
when 4) the nickel content is bigger than 8%, does not give the limit to the copper smallest content.
5) the molybdenum content possibly appears in manufacturer's instruction booklet, but to certain use situation, if has the essential definition molybdenum limit content, then must indicate in the order form by the user.
6) the molybdenum content possibly appears in manufacturer's instruction booklet.
7) like the chromium content is lower than 17%, then the nickel smallest content should be 12%.
8) achieves 0.03% austenite stainless steel to the greatest carbon amount, the nitrogen content is highest may achieve 0.22%.
9) to organize stably, the titanium content should ≥5×C%-0.8%, and should according to this table suitable symbol or the niobium and (or) the tantalum content should ≥10×C%-1.0%. And should symbolize suitably according to this table.
10) to large diameter product. In order to achieve the stipulation the mechanical property, in manufacturer's instruction booklet, possibly has the high carbon content, but should not surpass to the austenite steel 0. 12%.
11) the titanium content is possibly ≥5×C%-0.8%
12) the titanium content is possibly ≥10×C%-1.0%

Sixth, non-ferrous metal manufacture bolt, bolt, stud and nut
Is suitable in various performance rating non-ferrous metal fastener's material trademark: (GB3098.10-93)

Performance rating	Material trademark	Standard serial number	Performance rating	Material trademark	Standard serial number
CU1	T2	GB5231	AL1	LF2	GB3190
CU2	H63	GB5232	AL2	LF11-LF5	GB3190
CU3	HPb58-2	GB5232	AL3	LF43	GB3190
CU4	QSn6.5-0.4	GB5233	AL4	LY8, LD9	GB3190
CU5	QSi1-3	GB5233	AL5	-	-
CU6	-	-	AL6	LC9	GB3190
CU7	QA1-10-4-4	GB5233		-

According to supply and demand both sides agreement, when the supplier can guarantee the mechanical property, may use outside the table the material.
In order to guarantee that the fastener meets the related mechanical property requirement, by the manufacturer determined whether to carry on the heat treatment.

Attaching: Suitable international standard material trademark

Performance rating	Material serial number	Standard serial number
CU1	Cu-ETP or Cu-FRHC	ISO1337
CU2	CuZn37	ISO426/1
CU3	CuZn39Pb3	ISO426/2
CU4	CuSn6	ISO427
CU5	CuNiSi	ISO1187
CU6	CuZn40Mn1Pb	-
CU7	CuA110Ni5Fe4	ISO428
AL1	AlMg3	ISO209
AL2	AlMg5	ISO209
AL3	AlSi1MgMn	ISO209
AL4	AlCu4MgSi	ISO209
AL5	AlZnMgCu0.5	-
AL6	AlZn5.5MgCu	ISO209

Seventh, from attacks a kind of bolt
1. from drills tapping screw's material (GB/T3098.11-1995)

Chemical composition, %						Material trademark reference
C		Mn		P	S
min	max	min	max	max	max
0.13	0.27	0.64	1.71	0.04	0.04	20Mn, 15MnB (GB699)

Note: The permission boron's content scope is: 0.05-0.30%

2. from pushes the bolt (including tapping screw) (GB3098.7-2000)
From pushes the bolt application cementation cold dui manufacture. Table 1 gives the material chemistry ingredient is only guidance.

Table 1 chemical composition

Analysis	Ingredient limit, %
Analysis	Carbon	Manganese
Ladle sample	0.15-0.25	0.70-1.65
Examination	0.13-0.27	0.64-1.71
Note: If and (or) the aluminum causes the boron which through the increase titanium does not have an effect to receive the control, then the boron content may achieve 0.005%

3. the tapping screw by Leng Dui, the carburizing steel makes (GB3098.5-2000)

4. wood screw's material trademark (GB922-86)

Type	Material trademark	Standard serial number
Carbon steel	Q215, Q235	GB700
Copper and copper alloy	H62, HPb59-1	GB4424, GB4425

Note:
1) different smelting and the pouring procedure manufacture's steel products material may use similarly.
2) “the trademark” in the fence every one page-deep arranges in order each material, may be mutually general.

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